My friend’s earned time off was given to some mommy

My friend who’s childfree like me worked so hard to get these days off. She worked overtime and everything so she can take her mother (who’s never been out of the country) on vacation. They took an entire 5 of her hard earned days to some mumma so she can plan and celebrate her spawn’s first birthday party. The other lady gave her vacation days willingly to this mumma but they never asked my friend! Once she confronted her shift manager about this, the manager simply said “I thought you’d understand, it’s his first birthday!” This momma walks around shoving her baby and kid pictures in everyone’s face which sounds terribly annoying. These people treated my friend like an ALIEN after she was not ok with having her hard earned days taken without permission because “Oh! It’s the little darling’s first birthday!” She already took this up to the state and I really hope this gets resolved before her vacation starts because she was planning this months ahead with her mother. Man I just hate how someone can get whatever they want simply because they plopped out a kid!!