I think my gf is crazy for wanting to say I love you everytime we get off the phone
Why do you think her saying that is crazy?
Because we've just started dating and we can say goodbye without saying I love you.
It's mean to call your gf crazy. It's perfectly reasonable for her to want to tell you she loves you.
I'm going to call her crazy anyways.
Calling your girlfriend crazy will make her feel insecure and she won't feel like you care about her. If you feel uncomfortable with her saying that she loves you, then let her know, and tell her you won't be saying it until a little while longer into the relationship.