I'm really worried, and I don't know what to do because I think things could work out?

My girlfriend broke up with me about 4 weeks ago, and we had been dating from the start of January, on and off, so for 3 months, then a 2 week break and then another 2 weeks. We did lots of things together and we both lost our virginity with each other too. We had been friends for ages and we kissed and then things progressed to us dating. Anyway, she suffers from depression, and it gradually started getting worse from about mid January when she started seeing doctors and being on medication. I stuck by her even though some days were unbelievably hard since she would push me away and I thought we were in love. Anyway, we split up and got back together, and then she broke up with me again, claiming that everything was too hard for her and she can't deal with relationships. The thing is, we stayed close, for a week it was like nothing had really changed but then over the past week or so we've fallen further and further apart, but I've still seen her pretty much daily because we go to the same school. So making her miss me hasn't really been an option, and even though we have made up, things are still tough, as we do still argue sometimes. She sometimes claims she still likes/loves me, and every now and then I see little glimmers of her still liking me and potentially maybe getting back with me, but this is outweighed by her showing she doesn't still like me. I won't be seeing her till Friday now, and then after that I'm on holiday for a week. In the past whenever we haven't been with each other for a long time, the next time we meet up everything is good because we've missed one another, and that's how she got back with me last time, we hadn't spoken in 5 days and she realised she wanted me back. So I was thinking of doing something with her a week on Friday. But then just over a week later she goes away on holiday for 2 and a half months. I'm so worried that she will get with a guy for the holiday and end up having sex with him and stuff like that. See my hope is that she will come back from her holiday feeling better because she will have her space and time to recover away from everyday life, and so when she comes back she will perhaps want to date again, she hints that could be something she will want to do. I know I just have to wait and see, but will she get over me in those months? We have always been close, so I don't know if she will. And what should I do? I still love her, but I just don't know what to do. Oh, and also, the week before she goes away, we organised to have sex everyday that week to make up for her being away, and this was arranged after we had broken up. Should I see how the Friday goes and then ask if it's still on? The problem is she has no sex drive so I don't know how I can persuade her. She says it is unlikely that she will end up hooking up with someone else, but I can just see it happening. What should I do to make her get back with me? Thanks.