Unless he's leaving Chicago Med, there is little chance of this happening. And really, Chicago Med seems like the long term job over Arrow at this point.
While I agree, she wasn't jawjacking too much there. She screamed him down, shot and killed a bunch of his men, then moved in close to melt his brain. Now if she had just done it, then boom! End of story. But because she HAD to get a line in, he got the upper hand again.
She killed a ton of Nazis in the crossover. Another reason she's one of my favorite characters.