I pushed her away by trying to keep her, now how do I get her back?

Me and my girl had a 6 month relationship which was very intense and got very serious very quick. We discussed moving in together and everything was great. I didn't see her for about a week and a half and when I saw her again I knew it was over. She explained that she had been thinking of certain things about me and "fell out of love" but wanted to see me for the 5 days we had planned to see each other to make sure she was out of love. I told her I would take steps to correct the issues. The 5 days went well, saying she still loved me and "we are going to have adorable children" on the last day of her visit. The next day she said she needed a little time to think and I pressed her for an answer if she wanted to be with me or not; she chose not to because she wasnt sure. The following day I called her up and told her to take her few days and get back to me. Thinking that I had no chance in hell, but also thinking she was still in love with me, I drove to her house (2 hours away) to show her I care--it didn't go over well. Over the next few weeks I had reached out through text, AIM, one call and an email (a total of 4 attempts at communication after I went out there like a fool). I feel like I pushed her away, and all I want is to have her back. Perhaps if I had given her her space I would not be in this situation. It is important to note, however, that she has a pattern of being in a good relationship and then leaving when she comes up with an issues (as opposed to working through them). Any advice? HAve I lost her for good? What can I do to get her back after I pushed her away like that?
I pushed her away by trying to keep her, now how do I get her back?
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