Chalk it up to first-time founder mistakes on both sides. Almost everybody drastically underestimates the amount of effort required to get a startup off the ground. So what seems acceptable at first ("yeah, this won't be hard for me, I can whip it off for you") starts to feel like you're getting massively ripped off later.
And I totally agree with the comments on other subthreads that she's probably not a very good Django dev. I wouldn't be surprised if this is her first Django project. I remember that I expected my first PHP project to take 3 months; it ended up taking 3 years (I didn't charge for it; it was a volunteer project in college).
I never had 94%
I was eventually ok with giving up founder level share, but expected founder level commitment. This is where the gap lies.
However in business, relationships and "karma" - for lack of a better term - are really what things are about. There are times when you should be looking at maximizing your position, and there are other times when you should be looking to cooperate in order to maximize a collective position.
Many of the people here (myself included) are simply stating that the dev displayed poor business acumen by being too aggressive in taking advantage of another's weaker position. The key being who that other person is - her supposed partner.
Partnerships need to have a level of loyalty beyond any particular transaction or they simply won't work.