I'm not really sure I got everything in your post straight but I'll try..... Personally I think the earlier they learn about sex the more educated they are and the more prepared they are. My school taught abstinence only education and it was known that those classes were beating around the bush and not straight forward which is dumb to do with kids who are getting close to sexual maturity (if they're not already there).

Did she go into detail with the being abused story? I have noticed that girls around middle school age will do almost anything for attention. My niece even made up a story about something along those lines to her friends and then told my sister (her mom) that it wasn't true - she just wanted to have one of 'those stories'. Which seems kind of sick to me, but some girls may feel that thats the only way to get someone's attention.

I wouldn't blow that off as nothing though. I would definitely talk to someone about it. Because what happens if you don't believe her and it turns out to be true? It's kind of hard to tell what you mean by her knowing "too much" about sex? And, I'm sorry if this sounds rude, but I can hardly understand your post with how you were typing. Hope I got the jist of it.