Move on, you’re not married. If You can’t align on how to vet the problem then you can’t align on the dozen other things you need alignment on. Cut your losses and move. It’s not failure it’s pivoting. Take the learning and move on, and make sure you vet your next cofounder throughly along what you learned from this experience. I will say, she wants to work on something that she has data she can sell. Selling, users, and traction will make the fundraise much easier. So try and see where she is coming from. But it sounds like at this point better to go your own way.