Welcome to YT, it is good to meet you and Maisie. She looks all Yorkie to me and very like my Alfie, same shape to her front legs and everything (only she is lovely and neat and Alfie always looks like a scruff 10 seconds after he is brushed)
I am from UK too and Alfie is KC registered, they are so alike I can't think she could be anything but Yorkie.

