Put yourself in her shoes as well man. She felt doubted too. Sequence of events were that she told you she wasn’t entirely sure what her career path was going to look like after college and you told her that it was incredibly important to you that she be ambitious and know just like you. I would ask the same question given the circumstances.

What’s odd to me is that the way you handled the conversation created the doubt within her which prompted the question, then you turned it around and said that you now feel doubted? Then grilled her for 10 minutes until she said she was sorry?

Try to look at things from another perspective. You can be ambitious without knowing exactly which path you’ll take. Sometimes your ambitions can even lead you down entirely new paths. Don’t think that she feels any less ambition because she hasn’t got it all figured out in the same way that you do. Everybody is different and will ultimately find their place in different ways.