Girlfriend doesn't make an effort.?

I've been with this amazing girl for a little over two months. She is the best thing thats ever happend to me. Ive had girlfriends before but none of them felt like this, but I dont know why. I liked her for a whole friggin year before I asked her out, she said yes. Anyways, It feels to me like she never makes an effort to be with me. All the time i ask her if she wants to hang out (couple times a week) Its during the summer and we live a few miles away from eachother. She always says she wants to hang out but when the time comes for us to hang out she is out doing something else. I'll give you an example. Alright so, Say Friday night I ask her if she wants to go to the movies saturday night, i ask her what movie she would like to see "I dont care" is what she answers so, its always me who comes up with times, movies places and errthang. Now like the next day she sends me a message saying that shes over at her friends house and she wont be able to go. This has happend a few times and it really does hurt. Should I talk to her about it? I really like this girl. I havent said I love you. I definitely would except for i never see her. I saw her about 3 or 4 days ago but I had a friend with me and we couldnt "talk" but before that time 3/4 days ago we hadn't seen eachother for over 2 weeks. I guess im just over reacting. Before we started ""dating"" all we did was talk over facebook and at school. Now while we are ""dating"" all we do is talk on facebook and sometimes hang out. (like 3 times over 2 months... i know pathetic right?) I just thought it would be different now that were going out but no. I cant break up with her, it would be much to hard but its like not even a relationship that were in. How can I fix this? She is very shy. she is known at school as the beautiful girl who never talks. We talk for hours on facebook each day about everything (not our relationship of course because whenever i try to talk about that, she just says "haha idk" or something like that. Its like she dosnt even have an opinion) ODIPJOasdjkfasd. Now im just rambling. anyways, if you managed to read through all of this gibberish I just wrote down please, PLEASE help me by telling me what i can do to make this better. Were both 15 if that helps.