What would you do?

So my family is staying the night at my in-law’s house tonight. And a series of things being said are really irritating me but I’m not sure if I’m overreacting.

1) we ate on the way here around 5. We eat an early dinner and don’t like to eat at their house.. because.. long story. So I made sure to feed them on the way here. Well, around 7-8 she said 5-6 times that they need to eat. I asked them repeatedly if they were hungry, they said no. My in laws get really mad about wasting food so I wasn’t going to force my kids to eat something. Then she tells me I haven’t fed my baby enough. She nurses and also ate on the way here.

2) she’s got an attitude. I guess because I told her I didn’t know for sure if we were coming because I wanted to discuss it with my husband first and I’d get back to her. She’s had an attitude since

3) I finally got the kids to eat a few chicken nuggets left from earlier, they asked for a piece of cake and she told them yes. I go upstairs to lay down with the baby and she tells my son he can have a muffin. He says “ok I’m going to ask my mom” she says “no just eat it, you know she’s going to tell you no”🤬🤬

I’m heated and thinking about packing up our shit and leaving now. Am I overreacting?? It’s like she’s purposefully trying to divide my son and myself or cause him to not trust me

What would you do?

-EDIT-

They didn’t cook for us. It was just leftovers or frozen dinners they wanted us to eat. The problem is that it seemed as if she thought I just didn’t want to feed them. I kept telling her they just ate and she kept saying they need to eat again before bed.

Also, I realize she just wanted him to have the muffin, it was just the negative comment about how I wouldn’t let him. I pretty much let them spoil the kids when we’re here. There’s not a lot I say no to because I want it to be fun for them. I told him yes when he asked before I even knew what she said.

Not being defensive or anything, just trying to give context.