1Wish, I can tell you that I'm in a similar scenario in that my WAW gave me the 'we got married too young' line. She's also trying to figure out who she is and what she wants out of life. I was 22 and she was 19 when we married 15 years ago. Initially I had the same reaction and that was 15 years into our marriage! How do you not know 'who' you are by then?? Looking back on it now, we were too young, even though we both wanted to be married. You go through so many life experiences in your 20's that you're start to realize who you are and what you want out of life.
The best advice I can give you is to give her some space/time. In the meantime, GAL- figure out what makes you happy (outside of W). Your hope now is that by giving W space/time, she'll come to realize that she wants to be with you. Trust me, pressuring her to stay or for a decision will only push her further away.