Hard to deal with

I would like to write about a person who is hard for me to deal with.
She is a polite person, but has too much confidence. She is cautious, so she usually doesn't do anything wrong. She hardly apologizes, but often justifies what she does or doesn't do. I know she is busy, and I sometimes offer to help her. She almost always declines my offer. I think her weak point is not asking favors of people.
She used to be one of my neighbors. We will never see each other