Yes she has to sort through her problems on her own.
But be supportive, send her little text messages like 'I'm thinking about you' ask her if she needs anything, buy her her favorite chocolate, hold her when you see her, walk hand in hand, all those little things can make a huge difference and let me know that she doesn't have to worry about you and your relationship as she's got enough stress as it is.
SO... Just be there for her where you can, every thought counts.
It's what she needs and wants from you at this point.
Make her your priority for a while and tell her she does not have to return the favor, allow her to make her problems her priority now, the way you react to this is crucial and can make a big impact on her and your relationship, if she does not want to tell you her problems then tell her if she ever needs you to talk or anything, that you'll be right here for her.
Good Luck