There's not enough details here to say what she did right and you did wrong, but it generally comes down to her idea probably solved a problem customers were wi

There's not enough details here to say what she did right and you did wrong, but it generally comes down to her idea probably solved a problem customers were willing to pay a lot for today and your idea didn't. If her idea was "when you pay me x, you get 3x back in new revenue" and your idea was a tarpit idea like "help people find what to eat tonight", it's really obvious why you failed.