She never invites ME, I always invite her... help?

My girlfriend and I have been going out for about a month now and we really get a long great. We always do stuff fun when we hang out and she always has a great time. Here is the problem: If I go to a party, I say "hey there is a party at _____ if you want to go!" or to the movies "Hey wanna go to the movies tonight?" or to my house "Hey wanna come over?" etc... even texting and calling I have to initiate it. Once because I was getting tired of doing all that, I waited for a WEEK without texting her, and she never once made an attempt to text me first. We ran into each other at school and talked but went a few weeks without hanging out at all. Why isn't she making the effort if she thinks I'm "the greatest thing to ever happen" to her? If she truly likes me so much why doesn't she ever try?
She never invites ME, I always invite her... help?
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