Agreed that they've exoticized her as part of the ongoing trend of not handling POC very well on the show. Still haven't entirely given up hope that Talisa is Jeyne telling tales of her mother's (or grandmother's) homeland and pretending to not be Westerosi because A) she doesn't look Westerosi and B) being taken for highborn (albeit foreign) is still an important layer of protection. But, yeah, I'm grasping at straws here because I really liked that Robb was caught in a Lannister trap that way and I don't want the Westerlings to be entirely written out.