Child care provider left my milk out 😭

I had to use a backup child care provider today and when I picked up my son, I found all of the breastmilk I pumped yesterday/last night completely untouched in the bag I sent with him. I supplement with formula because I don't produce enough so I know he had that, but I'm just devastated by this. I have such a hard time pumping and was so proud of the amount I got yesterday, only to find it at room temperature after a 9 hour day. I know she didn't mean anything by it and get that she never breastfed/doesn't understand what a pain in the ass pumping is but I'm still pissed (after all, I told her I was sending it and she knew to use it yesterday when I also had to use her). I go back to my normal provider tomorrow, who breastfed both her kids and totally relates. I just had to vent here because my husband doesn't understand at all