Aiyoh!!! try to understand =P she's facing a very hectic time now..... it's like o levels X100 times more stressful, cos it'll determine her future to a very large part. summore she seems like the type who really cares about her studies, from the way you describe her...
just hang in there! after the a's you can party with her

like you can buy her cards, small gifts, or flowers... to encourage her, and show her you're concerned about her, and thinking of her. doesn't have to be expensive, it's the thought that counts!