her mom better have a GOOD ass excuse for me to come close to liking her

Nope sorry. There is NO excuse for making your child feel unloved to that extent. So you had to work? So you're a single mother? SO WHAT?! Plenty of working, single parents still make their kids feel loved. You are just a waste of a human being, cos if you were a DECENT one you wouldn't cause your child the kind of trauma that just thinking of you upsets them