Mothers day, she gets a card for me to do for my mother as she was in town, I sign it, close the envelope, job done. She then acts a bit weird because I didn't let her sign it as well.
Never ever crossed my mind that she should sign it, I wouldn't sign hers to her mother or father.
Just mine who is weird on this (yes I know they are all weird generally) or is this a widespread female thing?
This is very common, its just that she wants to feel part of your life. And stopping her signing the card made her feel insecure and you did something without her.
Mine is like that sometimes with cards.