Could be a little of everything actually... T's aren't supposed to be your "best friend" because they're supposed to push you a bit (after you trust them of course)... otherwise, there's no point in therapy. If you have a concern with her brushing off whats happening in your life as "teenage drama/angst" then perhaps you need to find someone else.

People do need a good relationship/bond with their therapists to be able to get through some of the really tough spots (that therapy has a habit of unearthing).

Sorry, I'm not good at answers, but I thought I'd give it a shot.