I paid the 35% equity 8 months ago, only to have her quit when the going got tough.
My comments are mostly intended for bystander-readers who're thinking of doing the same thing - paying a technical developer a full salary + 1-5% equity to develop a product from scratch. There're a lot of people that still suggest that, and it really doesn't work, as you've found out the hard way.
I dunno what advice I'd give to you personally - it's a hard situation, as many others have pointed out. Probably cut your losses, chalk it up to an expensive learning experience, and move on, then try again some other time. As I mentioned in another comment, I think it's fairly unlikely that this developer left you usable code that someone else could pick up, so it'd be difficult to get a contract developer to push it to finish line. You could learn to hack yourself - Python and Django are not difficult - but it'd set you back at least a couple months, and then you'd still have to implement everything.
[Edit: last paragraph was on the assumption that her work was not even demoable, but rereading your post, it sounds like you've gotten to alpha but just need to incorporate the feedback in. If that's the case, a contractor might work, but be aware that it's harder to read code than to write code, and if the code quality is bad enough any contractor would just have to throw everything out and start from scratch.]
If you can find a technical cofounder, someone that you trust that you know is a good developer, I'd do that (and give the decent equity from the start!), and then they can probably write the whole site from scratch in a couple months. But it has to be someone you know well, someone whose skills you're sure about, because otherwise you run the same risk with them.
As happened here, apparently.
There's a whole chapter on this problem in most introductory game theory textbooks. The basic problem is that you cannot directly control how hard someone works, you can only give them incentives to work hard and then measure the output. Much as you'd like to say "She's a professional, you're paying her, she ought to do a good job," the real world doesn't work that way. She'll do a good job if it's worth her while to do a good job.
The economy is not fair. You can try to pretend it is and watch all your ventures get driven into the ground, or assume that you're going to get a raw deal sometimes and only take those raw deals when it leads to a sweeter deal later on.