Congrats on your new family addition. I agree with MauiGirl, you can give her a nickname, nothing needs to be changed on paper.
My pup has many nicknames, I hardly call him by his given name, he's the only pup I have.
I don't know if there will be
consequences from the breeder if you change her name on her paper work. Why would you even want to change that.
Hopefully one of YT breeders will see your post and can offer up advise.
As a heads up, YT does not have many breeders anymore, so do not be disappointed if one does not reply.
Have fun with your new girl.