Walk away and heal your wounds. You know the saying "experience is what you get when you don't get what you want"? You didn't throw away 1 year on this project

Walk away and heal your wounds. You know the saying "experience is what you get when you don't get what you want"? You didn't throw away 1 year on this project, you learned valuable lessons. Just make sure you do learn them, then time is not wasted. Been there. Maybe it's too soon for this advice, but still: next time try making something that doesn't require cultural shift, because, let's face it - you won't be the one who will cause it. Cultural shift is something you can anticipate and help with, but it's not up to a single person to do it. You could just as easily say "I have something people don't want". The real question is whether you feel obliged to return some of her debts (there is a difference between time and cash). Other than that, forget the brand, forget equity (it's not worth anything and it won't be in the future unless she pivots - and that has nothing to do with you anyway). Move on. The faster you do it the better chance you have of starting something better. And try to learn from the experience. What went wrong? How can you avoid it in future projects? Best of luck.