Am I overreacting??? 😏

Jordyn`s Mom
My daughter is 10wks old, and I just started back working last week. Thankfully her grandmother on her dads side agreed to babysit for me, so today I went to pick her up, and her step grandpa was there, and he asked if they could take her out of town with them this weekend from Friday when I drop her off, which is about 6:50am, until Sunday night, and I said I don't think so, because I miss my baby, and I want to spend time with her on the weekends since I work 10-12hrs a days, and that I don't really have that much milk to send her off for a full weekend. And he replied, "well you can't breastfed her forever, you need to give her a chance on formula", I'm like really??? 😏 I can breastfed her as long as I want 😑 And as I'm going into the kitchen, her grandmother was pouring out TWO 6oz bottles of breastmilk. I asked her why, and she said it went bad, because she had it out ALL DAY. I barely have milk stored up to just be pouring out milk, and at this point I'm ready to put my baby in a real daycare, because now I feel like I can't trust them to feed her the milk I send. Am I overreacting???