Now, I'm really not a Taylor fan, and never have been, but even young girls will love her at age 5. She doesn't swear but many (probably all) of her songs are about boys and herself.
I think Taylor says "Go ahead and tell your friends I'm obsessive and crazy. That's fine, I'll tell mine you're gay." in the song 'Picture to Burn'. I'm not too sure, as there is an edited version of this song where she doesn't say 'gay'. Her songs also have mentions of 'revenge'. But it's not that bad