Grandparent contact

So my sons grandmother dads mom seems almost like she refuses to have contact with me I don’t know why honestly. She butts in my relationship with her son she puts me down behind my back smiles in my face she never asks me about the baby she spends nearly all day talking to her son on the phone when she’s around she tries to be mom to my son by doing only what she sees me doing with him refusing to hand him to me when she’s done holding him. I’ve tried laying boundaries and giving her set days when she can see my son but she decides to come around when her son says she can even if he didn’t talk with me about it. I’ve tried building a relationship with her having conversations try bonding with the baby and her but it’s like she refuses to. The only time she cares is when her son uses our baby to talk to her he’s always telling me to send pictures but she never asks me she never asks me how he is or anything. Like I don’t exist. And her son keeps pushing me to basically throw the baby at her. It’s just draining I don’t know what else to do. It’s my son but when she’s here it feels like she tries to take over, when she’s not here I go unnoticed. And when I don’t send her pictures or anything they say I’m using my son as a pond. I never not gave her pics or allowed a visit when she asked but she doesn’t ever ask. She’s asked maybe 4 times in the whole year. Like to me she acts uninterested in my baby when she’s not here, in texts to her son she acts super interested. When she is here she acts like my sons mom always butting in when we make decisions regarding him not letting me speak refusing to give him back yo me will only give him to my boyfriend. I don’t know what to do.