I think I messed up with this girl?

This weekend I was really upset because I got into a huge fight with my abusive mother when I called her for the first time in several months. I was really anxious and on-edge as a result and wasn't really thinking clearly except about how to get rid of that feeling. I went to a concert where she was playing, and waved to her, and she smiled and waved back. After a few minutes I decided that I should get my friends because I felt uncomfortable being there alone, like she would judge me for it (stupid I know), so then literally ran away past the stage behind her and I think she saw me. When I came back with my friends she didn't seem nearly as happy to see me, and she didn't say anything to me after the show. She graduated this year, and is leaving town soon, so I don't know if I'm ever going to see her again. I'm upset, because even though we were not that close I still really liked her, and wish we could have gotten closer. I already facebook messaged her and said I was sorry I missed her after the concert. What, if anything else, should I do?