What frustrations with her life in hiding does Anne describe during this period?

I still don't know what period you're referring to. Anne's life in hiding is filled with isolation and frustration. She doesn't get along with the Van Daans, she is annoyed with all of the bickering between the familes, and she worries about their safety.

Anne is also moving from girlhood to adulthood in the worst of circumstances. After awhile, she no longer feels like the hiding is an adventure, and she begins to feel closed in, and she's also extremely bored.