HELP!!! My girlfriend is having issues that I don't know how to help her with!!! Please help!!!?

My girlfriend and I have been together for seven months. We were friends all last year, too. I'm in grade 12 and she's in grade 10. I'm two Since september, she has had to go through some pretty rough issues. Her grandfather got really sick and she missed a month of school going down to see him. She has had to do school on Saturdays and Sundays to get caught up. Then her grandmother was put in the hospital, too. She went to go and say goodbye and you can imagine how hard that would be, but her grandmother hasn't died yet. When she came back from seeing her in the hospital, her uncle died. She is also a straight A student and for her its heartbreaking to get a "bad mark". She is the ultimate people-pleaser. She has four parents due to divorce and has to live with four set of rules and expectations to live up to. For her to make one happy makes another frustrated. On top of that, she is competitive in a certain sport and has to train 7.5 hours a week, plus at home daily. She is running for 'Miss______' (our city) and that is another five hours in her week. She doesn't get a whole lot of time to rest and relax. She has been getting 6.5 hours of sleep if she is lucky and hasn't been eating a lot. She often skips meals, but she isn't an anorexic. She forgets to eat because she gets so absorbed in what she is doing. She is a really good actress. I can be talking to her and she'll be on the verge of tears. Someone will walk in the room and ask her how she is and she answers like its one of the best days of her life. It scares me to think how when I ask her how she is doing she could be playing me. She is really open with me, our communication skills are great, but she is tired of people telling her to eat and sleep. Two years ago, there was a similar situation she was in, but less intense. She had suicidal thoughts, but thankfully she has given help before going through with them. I didn't even know about the suicidal part until a few days ago. She had plans of writing it all out in a letter and then reading it to me, but her friend told me first. I asked her about it and she said as bad as everything looks, she has no suicidal thoughts and enjoys life too much to stop early. She still smiles, but its not the same as before. It doesn't go all the way up to her eyes life it used to. How can I be an encouragement to her and help her? I'm leaving this week for about a month and won't be able to contact her at all. Not even with snail mail!! Please help! Any answer is welcome!!!!