Venting about mother in law

My fiance is a mamas boy. Hes so respectful and his mom is nice. But she's stubborn and always has to be right. She is OCD and has to have the last word. We had a baby. His mom has been helping but only when his son is there. Which I understand. She has her opinions like every grandma does. But latley stuff has been rubbing me the wrong way. She's sleeping over and her son is at work. She kept joking about how it's going to be me with the baby in the middle of the night. I get it. You dont want to be up at night and help me. Just tell me. Then I talked about how I wanted my sons hair curly and she keep talking and saying how she says no. It wont be that way, I vote no. But multiple times to show her point or opinion. And then I packed a lunch for him. She was obviously observing me because she said. I saw how you packed his lunch. Then, when he came out running late, he wanted some fruit. I said he was running late and I put an apple in there and I would make him breakfast with fruit tomorrow or pack it in his lunch next time. She said oh, why dont you check the lunch to see if you like what was packed. Kinda like saying I didnt do it right or I'm a child. To me..I think that's between me and him. I think I know my fiance pretty well. And certain things she shouldn't say. It just hurt my feelings. I'm just venting .