She goes by Sierra.  Web search results for her e-mail address indicate that she formerly practiced as Sierra Skyy in Kansas City, but she is now apparently based in northern MN. Her site merely says Minnesota, but her listing on Sophie's outcall.net [linked below, with link to Sierra's own site] says "based in the (218) area code...Bemidji, Grand rapids, Baudette, Duluth, Mille Lacs and the Twin Cities areas."  Note that TER has never to my knowledge listed a single provider in the 218 area code--so if her performance is anywhere near up to her looks, this could be great news for the frozen northland, spendy though she is.