Launch immediately. It's your idea so you have a better understanding and the ability to innovate much faster than she ever could.

Who cares if she was 'first' to do it...just make one that is better.

Someone mentioned partnering up with her - don't do it. "Fool me once, shame on you, Fool me twice, shame on me"

What a shame, a friend messing up another friend. This industry is definitely more cutt-throat than I thought.