5 day old milk

Pretty sure daycare fed my baby 5 day old refrigerated breast milk. Do I need to worry? She seems overall ok.. I’m going to call her pediatrician but I would also like to discuss with daycare. I label ALL bottles with the date I pump And the date it expires. It’s disappointing they aren’t reading these. They had the milk from yesterday and the bottle was returned.

It was something I saw this morning while dropping her off and said “this expired yesterday, I’ll put it aside and leave in her lunch box, please don’t feed it to her” She came home with all bottles empty.