Hmm, I'd say either Caribbean (PR/DR) not cuban though since cubans have thick accents, or Gran Colombia (Colombia, Panama, Ecuador) No Venezuela though, I can smell chamos from miles away and they have this nasally, stuck up kinda accent.
Tag me or any of the other latinos here when she does eventually speak some spanish, her english is pretty much native and she was obviously raised in the US, but her spanish would have been influenced by her parents or whoever taught her so then we will know for sure.