What Should I Do About My Friend Problem?

Lately my friend Emily has been very distant from me. She's gotten to that age where all she wants to do is find a boyfriend and she's started going to teen clubs with friends her age(I'm a year older). I can't really blame her, after all she is young and she should go out and enjoy her life. The trouble is that when she goes to these clubs she never invites me or even bothers to offer a ride. Although I'm not the most sociable of people I'd still go with her but my mom won't let me go unless I have a ride. She doesn't even call me like she used to, all I ever hear from her anymore is when ether I invite her someplace or when she comments on my Facebook status. I'm going to be leaving for camp on Sunday and I'll be away for 3 weeks so my mom is taking me out to dinner, I thought about inviting Emily because on her last birthday her parents had promised to take her out to dinner but then they never did and her birthday was in December, so I feel bad. I just don't know if I should invite her though because I'm always the one asking her to go with me and I'm starting to feel like a doormat. I also don't want to be the reason why are friendship ends so I don't want to just ignore her completely.

Any ideas as to what I should do?