friend advice?!?!?!?!?

I have this friend that I talk to over the internet (JUST A FRIEND) we've been friends for 1 year, and 3 or 4 months. We used to talk all the time, but then it would go a couple days without talking, to a week, to more weeks without talking, and now we go months without talking, on her side, more than mine. I try talking to her, but she ignores me most of the time.

Lately however, she told me the reason she stopped talking to me, over me drinking, and it was only a one time thing, but when I talk to her, she replies within a few minutes or hours, depending on if shes on Facebook or not. But, she always says she misses me, and wants to talk more, but she never puts effort into talking. She says she's sorry for it, and she still wants to be my friend, she just doesn't know why she doesn't put effort into talking. She always breaks her promises to me now, and she never did before. So my question is, is the friendship worth it anymore? We never really talk, and I know it'll hurt her to say we aren't friends anymore, but is it honestly truly worth it to call someone a friend, when they never talk to you at all? Just barely and its a reply here and there every few days, and by then its like what's the sense of replying?

SO should I keep her as a friend, or have her become an ex-friend?

Please answer ASAP! i need to know now,...