My 15 year old niece texted me that she’s trans?

Okay so I think when she was 13 she came out and said that she liked girls. I was very supportive of that.

Right now I’m stuck and I don't know what to do or say, I want to be supportive of this.

Her father Gerardo passed away 6 years ago.

My niece texted me saying that’s she’s trans, that she goes by her/ him and she goes by Gerardo.

The thing I’m stuck with is the name. I can’t call my niece that. His passing affected me/ all of us and I don't know how I feel about calling my niece his name.

This is not a troll or anything, I really don’t know what to do. I feel like my niece is going through something and I want to be as supportive as a possibly can, I just don’t know about the name and what to do

I don't know where else to go or who to talk to about this
My 15 year old niece texted me that she’s trans?
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