Frustrated!

 I know i'd be a pretty good mom. I've been a live-In nanny, three times now. First for a newborn and her 4 siblings until she was 2 yrs. and then for a 3yr old boy for almost 2 yrs. and also for newborn twins for 11 months. Not saying it won't be different with my own. BUT. I know I can do it. 
Yet I know a girl with a 5 month old who is now pregnant again, and somehow continues to let her first baby fall off the bed, go without food/diapers/formula/clothes that fit, and screams at him, constantly calling him a "bad baby"?!?
EDIT: I have contacted the local child services.