I don't think there's anything wrong with dating at 15. And her lovey-doveyness is normal. But if she's lying to you, you have reason to be concerned. I have a niece who's 15 or 16 and in all kind of trouble. She's madly in love with her boyfriend, but I don't know anything about him. If you don't already, keep an eye on her Internet activity. I saw my niece's site on Xanga, and some of the stuff she posted there was very telling. She has signs of depression. Also check MySpace and other sites. There's no guarantee you'd find it if she didn't show you (because so many use nicknames, you might have difficulty finding any sites she has), but sometimes you do find them. I saw some of my niece's friends' sites, and the stuff they post tells me that either their parents don't monitor their online activities, or they don't care. You'd be surprised what kids will post. And it's a good idea to not allow them to post their school or any personal info that can help a person find them.