Name-Shaming *UPDATED*

So, I'm 24 1/2 weeks pregnant, and since the beginning of my pregnancy I had two names picked. Oliver for a boy, Olivia for a girl. Well, to mine and my husband's delight, we have been blessed with a boy, so I chose the name Oliver, obviously. I have told my mom many times that this is his name and unless I decide to change it on my own, it will remain as such. This is what I received on Wednesday.

She refuses to call him Oliver if I name him that, and will not stop sending me names. Anyone else have this problem or any advice to give me? I'm at my wits end with her.

Update:

So I tried to tell her and stand firm but she won't listen.

I dont know what to say or do to make her stop. shes my mom and I love her and I dont want to make her mad at me or decide not to do the baby shower (since shes the one throwing it) but I'm sick of this.