She did. But every person she ever one-shotted was some random goon or thug. She's never one-shotted anyone who actually has any decent durability showings. So I am not actually convinced that she could one-shot someone like Frank or Matt, assuming she can even manage to land a solid blow on two people who are way faster and more skilled than she is. I mean one fractured rib was enough to tip the balance in Simpson's favour in his last fight with her.
Edit: But I think she should be able to one/two-shot most of these guys, if she can hit them. But I went back to a lot of her fights, and she tends to get swarmed a lot. And if the guys have sharp weapons when they swarm her, she is going to get stabbed repeatedly.