Why did Aunt Maria Plan to go to her mother's house?

Aunt Maria wanted to know, so that she could avoid the insanity the next time he decided to complete a project in the house.

Aunt Maria would mildly observe that, next time Uncle Podger was going to hammer a nail into the wall, she hoped he’d let her know in time, so that she could make arrangements to go and spend a week with her mother while it was being done.