The sad thing is, I do actually know (a little; I've never taken a class or anything, but . . . well, Batman is my favorite character--so much that I harbor the silly fan's secret desire to maybe write for him one day, so I made a point to learn a little bit about his more iconic stuff: great in a fight, so I learned a bit about martial arts; a detective, so I learned a little observation and criminology; good at sneaking around and scaring people, so I learned a little stealth and psychological warfare) and that's why when Tim's "I'LL THROW OUT TECHNIQUE" hurt so much. Throwing out technique and being unpredictable might have worked on a precog, but that's not Cass's shtick. Her shtick is that she can read body language so well, so intuitively, that any opponent she faces--assuming basic humanoid shape and musculature--is automatically telegraphing their moves. It's impossible to "be unpredictable" with her, the most it would be would be to cut down her reaction window from several tenths of a second to dozens of hundredths of a second . . . and she'd still be fast enough to block/parry/dodge/subvert such blows. Bruce Lee supposedly had a striking speed of .05 of a second (5 hundredths of a second), and you have to assume that in comic books, the best martial artists are going to be at least as fast.
No. Being "unpredictable" isn't going to work. Throwing out technique also isn't going to work. The way to take down someone like Cassandra Cain in a fight . . . is not to fight her directly. For instance, no matter how good she is at reading body language, she can't read a wall collapsing on her. Or, if out in the open, pop an iconic smoke grenade. Can't read body language if she can't see your body. Entangle her--I'm pretty sure the utility belt has some "glop grenade" type weapon, for crowd control of course. Never throw a punch or kick, never try to grab her, never try to hold her yourself. If you don't use your body against her, again, she can't read your body language.
It doesn't guarantee a victory, but it's at least plausible that someone could take her down this way. And think about how interesting, visually, viewing such a physical chess match would be. In fact, in my fanon, I've retconned Shiva's defeat at the end of Tim's Robin title to be that--I've already retconned Cassandra's ridiculously out of characterness as never having happened. She was on vacation, or undercover with the real Anarky. Who also didn't appear in Robin's title post-1YL.