According to anne why mrs. Van daan is unbearable.

Mrs. Van Daan's Dutch is poor. She is vain and lacking in humility. Anne finds her to be the most insufferable annex resident of them all and is particulary annoyed when Mrs. Van Daan flirts with Mr. Frank. Peter Van Daan has trouble talking to her, this leads Anne to believe that she, like Mrs. Frank, lacks mothering skills. She dies in the camp at Belsen.