The Question and Answer section for MAUS is a great resource to ask questions, find answers, and discuss the novel.
It is 1944, and Anja and Vladek are sneaking back towards Sosnowiec. Hungary is safer than Poland. Vladek can easily pass for a Polish man, but Anja has more traditionally Jewish features.
She was in the possession of Communist documents.
Vladek does not believe in doctors know what is best for him. He leaves the hospital against his doctor's instructions.