Cutting my mother off

So ever since I told my mom I’m pregnant she wanted to be involved, but only to her standards. I’m having a natural at home birth, and I don’t want her there. She’s very loud, negative, it’s about her or the highway kind of person. And I don’t want to be stressed about her being there. Well ever since I told her it’s gonna be just my husband and I she at the house her attitude as changes a lot. And I understand you want to be there for your child, but I can’t deal with her and being in pain. She’s ALWAYS has something negative to say about my pregnancy, the nursery we’re doing, the clothes we are buying. It’s just always something. Well she brought a couple of baby Items (not a lot), and I want to return them. I can’t take the stress of always being put down, and not being able to feel confident in my decisions with MY pregnancy. Is it wrong to bring her back everything she brought for the baby?? Because, I just know she’ll try to throw it in face like well I brought this I brought that. Please help!