well she is obiously noticing that you dont like something, and she took the time to try and talk to you about it so that itself tells you that she cares about your opinion of her. i think you should have waited until the band director was done talking to her to talk with her, but since u didnt i suggest you talk to her next time possible, call her or go over to her house in person, i always find it better to talk in person because you also have body language to interpret that way.
Be true to yourself, this includes taking a step back and realizing that the best thing isnt always the easiest thing in front of you.
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