@boomerang,
Sozlet's gotten some gifts, they haven't come with a clear "I HAVE A CRUSH ON YOU" statement but that's been implicit and I haven't really had a problem with any of them yet.
The main thing we've talked about is what accepting presents can mean, especially depending on their size. (Small tokens OK, be more careful with large ones.)
I'd definitely let her go out for pizza with anyone I can think of who might ask, unsupervised. I guess the "anyone I can think of" part is pertinent, though, I know 95% of the people who might ask (and their parents, and their siblings). If I didn't know the boy that would probably be different.
She's not into dating yet, she doesn't mind the "nerd herd" (a group of about five fairly nerdy boys who collectively have a crush on her) and may have a crush on one boy but mostly just is friends with a lot of boys and is more focused on deflecting accusations of crushes.
I have been thinking about this whole thing a bit though because a big co-ed "Hunger Games" party is in the works, not sure if it will happen but if so it'd be 13 girls and 13 boys running amok in the woods, no supervision (except for some of us parents very far away). Some parents are worried about that, I'm OK with it but definitely have thought about it a bit.