I have some anecdotes and a recommendation.
1) In grade 2 I was identified as a gifted student. This was in California, but gifted programs weren't what they are now. I was sent to a grade 3 classroom for math. In grade 3 we moved and I was able to go a school that clustered gifted students together in classrooms (still the thing I think works best), and I was able to do math with the 4th graders, which was more advanced that what the non gifted grade 4 students did. In grade 4 we moved again. I started at a school that didn't have a gifted program at all, but my mom advocated for me and got me into a school with grade 4-6 students clustered together. We had classroom periods like they do in middle and high school. I was placed in the highest level math class consisting of mostly grade 6 students -- I was the only grade 4 student in the class
Everything fell apart in grade 5. Our school no longer had grade 6 students, and I had already taken the highest math class offered. I spent that year doing workbook type math, and I could do the week's worth of work in under half and hour. I missed school days every week because I was so bored. Grade 6 was no better. We were no longer clustered together as gifted students and the middle school didn't mix 6th graders in with the other grades for academics. I got to take the highest level math offered to the 6th graders, which was taught by the teacher I had in grade 4, and was no different than it was then. He actually apologized to me that I had to do it again, but it wasn't his job to offer me enrichment.
I'd like to say my math interest stayed bright, but it didn't. I did pre-algebra in grade 7 because that was the highest math they would let me take. Algebra was grade 8, and that again was the highest math offered at the school. By the time I got to high school my interest in math was squashed. I took geometry and algebra 2 and that was it. I should point out that my parents had zero interest in my giftedness, or maybe they were too focused on making ends meet and dealing with my siblings -- a smart kid who doesn't cause problems can be overlooked when other kids are using drinking, using drugs, dropping out, etc. They also trusted the schools to do everything.
The lesson I offer from this is that a child's interests and abilities can be bored out of them, so to speak.
2) Our youngest son was clearly math gifted from a young age, but in a very intuitive manner -- he could solve algebra problems at age 6 but couldn't explain how. I remember when he was 5 years old he saw a sale sign that said, "Buy 1 Get 1 50% Off" and he casually remarked to us, "That's just 25% off each one." At that point we hadn't done any math with him at all other than learning numbers and the usual things children learn in the home when cooking, etc. He was also a stubborn child. We tried so hard to ground him in math processes, but he hated the work. The educational specialist we worked with insisted that we not let him fly ahead in math because she thought he needed to understand how he was getting the correct answers. And I figured she might be right, as I had also been intuitive and then struggled a bit in geometry because I wasn't grounded in showing my work. Over the years I've wondered what would have happened if we had given him more challenging work back (more than just a couple of grades ahead). Maybe he would have been willing to learn the processes because he wanted to understand the math.
The lesson I offer from this is that it might not be good to hold back a child from their natural abilities.
We homeschooled our children K-12. Our oldest had a bit of math fear in him. I taught them math myself using various methods and curricula up until it was time for algebra. In grade 6 everything clicked for my oldest and his fear disappeared -- we did two full grades of math that year. Starting with algebra we found a solid online program and they used that for algebra, geometry, algebra 2, and precalculus with trig.
What we used was Teaching Textbooks. Back then we could buy it as CDs, and I always bought the physical textbook and made them watch the lesson, then work the problems out on paper before putting in their answers. Now it's a subscription product. When we started algebra was the lowest level offered -- this has since changed and I would have gladly used it for everything they have.
There were some negative reviews of TT, including people who said it wasn't rigorous enough. I will just say this: both of my sons took assessment tests and were approved to place directly into Calc 1 in college. My youngest realized he doesn't love math as much as he does coding and computer science, so that's the direction he went in. My oldest is working on a B.S. in Math with plans for an M.S. as well, and his advisor says he's PhD material. So I would say TT is a solid program when used right. I know parents who don't buy the book and let the kids do everything online, and then wonder whey their kids don't really know the math. I would say they need the process of writing down the problems and solving them on paper with pencil -- it transfers better to the brain that way. My kids were never allowed to simply see the multiple choice answers and make an educated guess -- their answers were on paper first. And I'm also glad we used TT even though it's online, because these days universities use MyMathLab and MyStatsLab for homework and some quizzes, and my boys learned solid learning methods combining the online and the book.
Here's one more thing about TT: My oldest broke his hand just as he was starting TT geometry, so I sat with him to be his scribe. I'll admit that geometry was my nemesis in high school, mostly because I was socially anxious, but also because I didn't understand logic necessary to do proofs. TT geometry starts with logic. A month into doing the course with my son, I understood geometry better than I ever had before. I could do proofs. Even more than that, I came to love geometry instead of being a little afraid.
If I was in your place I would give something like TT a try before hiring an expensive tutor. It could take your daughter pretty far.