Frustrated by my mother

I'm pregnant with my third child and third girl. I was pretty upset when I found out it was a girl, but I'm coming to terms and I'm still excited. I discussed my feelings with my mom and she came to visit this past week for thanksgiving. Ever since then she's on the kick that my husband and I somehow think this baby is a mistake because it's a girl, and continued to add that my husband now wants to adopt a boy, and this girl is just in his way on his way to getting his boy? I told her very specifically yes, he wants a boy, but he loves his girls, if anything I was far more upset than he was that it was a girl and I told her that. And she proceeds to add that I'm only upset because I know how much he wants a boy, like my feeling towards the matter don't matter and my husband is some selfish animal. I don't get it. Every time she comes to visit she thinks she has the right to tell me everything and anything we're doing wrong.  😪 she drives me insane. How do I tell her she does this in the most respectful, yet stern way? I'm bad with confrontation, especially with those I'm closest to.