Turns out she's same as Met/Kati B. Her real name is Ekaterina Nekrasova. She has a model card at
http://www.fashionbank.ru/models/user/1268.html. When you look at some of the pics there, you may recognise some from her "igneus" set on JTS and from her "Presenting Kati", Charlotte and "Moixel" sets on Met. Below is what I have of her.