She was raised in a hunter community and doesn't know she is a mutt (human/werewolf) so she has enhanced abilities that made everyone consider her a prodigy. I would say they have run into each other of missions here and there and probably because they both strived to be the best they butted heads here and there.
I also feel that the fighting and missions would be the really they get together as a thrill they both enjoy. What do you think?