Weird request from MIL

My mil has been literally begging me to breastfeed my son in front of her. I formula and breastfeed him and everytime we go visit and he gets hungry she tells me over and over she wants to see me breastfeed which infind extremely weird and uncomfortable. I only breastfeed my son some nights or once in a while when we are home and I pump too. I told my husband I don't feel comfortable doing it and he told me I didn't have to because he knows I'm really reserved and although I've told her the same she still keeps bringing it up. I know some people will breastfeed in "public" but I'm just not comfortable with it