No experience and not a lawyer here either But even putting aside all the money-talk, while I was reading the story I almost feel like she's not being very res

No experience and not a lawyer here either But even putting aside all the money-talk, while I was reading the story I almost feel like she's not being very respectful of the effort you have put in. It sounds like you and her have a co-creaters relationship, and you have participated and put in equal (if not more) amount of work throughout the entire project. This "I should have 100%" thing makes it sound as if you were working under her all along and she's asking you to sign away all the rights you have for your project. This sounds bad but think about it, she might not even have this app today if it weren't for your effort, why does she own the right to claim 100% of the app?