my husband's mother person, said I was a bad mother because I take a few hours a week to spend time…

my husband's mother person, said I was a bad mother because I take a few hours a week to spend time with a friend. and I can't take the baby because I walk there and it's cold outside. is this opinion shared? that a mom isn't a good mom unless she's 100% spending all available time with baby? I already have ppd and I'm having issues pumping and never got the latching thing .. but is she right?