MIL wants my sons pacifier.. 🤦🏻‍♀️

I’m sorry I’m ranting a bit ...

So my MIL has mentioned to me multiple times about wanting my sons pacifier when he’s done using it. Apparently she has my husbands niece & nephews pacifier. I told her no because I want to keep it but than goes and say to just buy another one which is pointless to me 🤦🏻‍♀️. I just don’t want her to have anything of his. I didn’t even let my own momma take anything. He’s my son and I want to KEEP his stuff for my self. Am I being an ass not letting her have it?