Hmm... She doesn't really hide them, nor does any of the Shifters actually "hide" their mythic side. They just transform. Furthermore, it's only in some stories that Kitsune have trouble hiding them. anywho, you don't need to change anything. I think it's a nice little thing. And it is possible that Shifters can spots small clues or signs that gives away a person as a Shifter while normal humans can't.