Is it okay for your mom to not call you by the name you picked?

So… I came out as trans about 3 times and I told her to ask me anything if she was confused about something.

At first she was asking “well how will your niece react?” And my niece already knows and calls me by the name I picked and calls me by he/him pronouns.

The first time I came out to my mom, it was Christmas and I made a video explaining how I felt and she just laughed.

The second time I came out was with nail polish and I asked her if the trans flag looked okay and she never answered.

For the third time, I did it on my graduation day and she still deadnames me and calls me a girl.

I’ve been trying to correct her gently and give her reminders but she’s acting like I’ve never been this way… is it okay?