Should I say something?

I am a cap worker (basically a babysitter paid through the government to watch a special needs girl). Well I have known this family for a long time well the mother just got a new boyfriend and has Been spending a Lot of time with him and has Been coming home late every day for the past 2 weeks. It's just getting a little annoying because I don't get paid for those 30 minutes that she's late everyday. So my question is - should I say something to the mom or just wait and see if things get better??