1. She doesn't trust me - I hurt her in the past. I don't entirely trust her. We both understand this at this point.
You don't trust each other and are operating as if you're both trying to control each other. Without a foundation of love and TRUST, you don't have a chance in hell of having a real and healthy relationship. You are may care about each other, but neither of you are in a place to be WITH each other... and honestly I'd gently suggest neither of you have done enough inward growth/examination/healing to be in any sort of an intimate relationship.
2. She's struggling - she's taken a job but it's only giving 25-30 hours a week. She mentions frequently her fears of never having a good job/being back to square one. In her mind that job was her only way to get experience and find a better paying job. I've tried to explain to her that it was not a actual PM position (desipite the title) and that being in that position (40k for 70 hour weeks) is very obtainable. Currently we are discussing routes as I want to help her find a job so that won't be such a determinate factor stressor.
She's an adult. She should work on finding herself a job and other resources to support herself, not expect or allow you to step in to direct her life.
3. I understand this isn't sustainable but she literally has nothing - I want to at least help her find a job or some income sources that don't just leave her homeless or jumping around to random places to stay fed/warm. It's insane but I feel slightly at fault - she left the job partly because of me - etc.
She does have many things. She's a fully functional, basically intelligent adult that managed to make it to her 20s without your help or assistance. Until she met you, she was coping for the most part, and she will figure things out again if you allow her to. She may make more mistakes but those are hers to make and you are not her parent and not responsible for her. This isn't sustainable but you need to understand that YOUR need to feel beholding and caretaker for others is also damaging to both you and her (and any other partner you may hook up with in the future).
I know you feel responsible but this is another sign of your codependent training. Savior complex, caretaker, feeling responsible and trying to care for an otherwise outwardly appearing adult is a sign that you're too enmeshed with their issues. I reiterate the suggestion to check out the book "Codependent No More" (there's even an audio version) and do some thinking and discussion with your therapist.
Please don't think I'm trying to be harsh or judgemental towards you. I am absolutely coming from a point of view of "been there, done that" and just hope to help you sooner rather than later. I figured some of this out MUCH later in life and if anything I can say can help point the way towards better relationship/mental health, I'd be over the moon happy for you.