Damn. I feel for you then. If she's gone, she's gone. Fat chance she'll even document/transition the app. She's probably gambling on the fact you have no money to pay another developer so she figures she won't have to do it.
As others have said... learn to program. Consider it a character building exercise. I don't see too many other ways out of this situation.
That said, I don't think she was being malicious here. Most of these stories don't involve malicious folks. But when working with contractors you have to factor significant cost overruns as a reality. The work will be costlier and take longer than you expect.
EDIT: I also forgot to add. This is a litmus test. If she thought that her work would yield dividends, she might just bite the bullet and work for free until everything is finished. But she's not. She doesn't have confidence in the viability of your product/service. You might want to probe her and ask why. If you aren't going to get much out of her, you may as well at least try to get some feedback.
Scope creep was limited.
The company owns the IP - we did sign paperwork on that.
In case it isn't clear, at the time I did agree to giving her the 35% in equity. I currently own 45%.
She has agreed to documenting and transitioning the app.