When I came across this girl, she reminded me of Lanny. So even though Hallie probably isn't her actual name, coming from an escort site that uses pictures of professional models for their escorts, I still think she looks kind of like Lanny.
You're right it's her sister Kimberly, but it's hard to tell because some of the pictures are reversed so their opposite arm tattoo doesn't help and their different thigh tattoos aren't shown.