Just sharing my story:
DS has been reading for some years. Similar situation in kindergarten last year: began the year far ahead of end-of-year goals. The teacher was supportive, but had 21 others to work with, too, so not a lot of time. The school's emphasis was on making sure the children are well-rounded, so writing, numbers, etc. That is a good first priority, but not enough. Like others, the school does achievement testing 100% in 2nd grade, and begins tracks then. After some reluctance by the teacher and asst. principal, who is in charge of G&T, we got him tested in kindergarten. Turns out, there were 3 other families in a similar situation to us, who had been pushing for some action. Sharp DS remembered the names of the other 3 kids, and with a little PTA directory magic, I reached out to them. Firat, I was just looking to talk, and to share our experience--possibly work with the school together. But the kids get along, too, and they enjoy having friends they can do their "different" things with: jigsaw puzzles, checkers and chess, book exchange, etc. All intermixed with playing on the playground, museum outings, etc.
This year, the school did begin a 1/week pullout class for them. They are supposed to also seat them in the same class, so they can work together, but that didn't happen. Next year we will make sure.
OP, the details will depend on your daughter, and you will have to discover them. But whatever you do, keep encouraging her and advocating for her with the school. They have had a he'll of a couple years, so try to be patient. But they also are attuned to standard / average achievement, so also need your support to do more. If you are lucky, you will get teachers that respond to that challenge. If not, there is plenty you can do at home to really further her education.