My girlfriend ended our relationship so suddenly, how can I get her back?

We had a really great relationship, it was so real and she developed feelings for me so fast at first I thought she was coming on a bit strong but I ended up liking that about her. It was nice to know she actually liked me. She would send I miss you texts, and texts saying Yay! I get to see you today! She even cut class to be with me one day which is a big deal. Anyway we were planning on a trip together, and everything seemed so great. Then it happened, one day we were having dinner, going shopping, talking about our next date while we cuddled on the couch and fell asleep, the next week she broke up with me via text telling me she was overwhelmed with going to school full time and working full time that she couldn't give me the time I deserved. We couldn't see each other as much as we did in the beginning and it feels different because the less I see you the more and more distant I feel. This is what she told me. She had to work on herself and assured me several times I did nothing wrong and she didn't want me to wait because she wanted me to be happy. It just seemed so sudden I know our feelings were real and I just don't understand what happened. What should I do to get her to come back to me?
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I did a follow up tonight with her. She still can't see me or talk to me she says she can't handle it. She again reiterated that she needs to clear her head. I asked her point blank if she would be with me still if her schedule was less demanding she told me yes. But right now she needs time to clear her head. I really truly believe she is overwhelmed. I am giving her space and letting her miss me. What more can I do.
My girlfriend ended our relationship so suddenly, how can I get her back?
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