Cass is in the comics the best Martial Artist (with the occasional exception of her mother but they really alternate but in the end Cass will win)
Cass can by far beat Batman in a straight fight. If she can see or hear him, possibly even smell him she can beat him.
She can take almost any punishment up to and including being shot, and not slow down.
She is so fast and strong several people have mistaken her for a meta human. She is to the best of my knowledge the only non meta human in dc to be able to dive bullets once they have left the barrel.
Cass verse Batman is hardly a contest, Cass wins.
