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It's a simple case. The public school is full of kids: aka little adults who try talking about big adult things. It is difficult to feel secure with today's school systems teaching, but remember God is the protector. Be open to your daughter having questions, and make it clear to her that you will always listen... that there are no questions off limits. If she comes home with questions after visual exposure to homosexuality take her right to the scriptures in a loving way and teach her that, although God says homosexuality is clearly wrong, not everyone believes the same way... and it is up to God to convict and up to her to live a godly life. Such a feeling of personal responsibility that is God centered will be a lifelong lesson.