Admission to Bryn Mawr is a real blessing to you. Don’t thumb your nose at it. Look at research regarding the percentage of students that go on to get PhDs and such. BMC is right up there, especially when comparing % of students and not total students (since BMC is so small). Your teacher you refer to actually went to Smith, so she’d have a natural bias. BMC belongs in the same discussion as Smith and Wellesley for sure.
http://talk.collegeconfidential.com/discussion/comment/19805310/#Comment_19805310 is a specific post in an interesting thread from last year that compared all sorts of rankings for LACs in STEM areas. Notice the company BMC keeps on this list. I’m sure you could find similar data for med school somewhere, but i haven’t looked for it.
Do an overnight at Bryn Mawr to see how you mesh with the other students.