she probably has some of the best pain resistance in the whole mythos. Up there with caedus and other sith who feed off pain. In her fight with welk she got her head tk'ed into a wall almost knocking her out, got half a meter of her tail cut off, got blasted with lightning strong enough to paralyze her, had a big enough piece of her skull sliced off that she thought her brains were falling out-"Something spongey and warm landed on her shoulder beneath her head wound. She hoped it wasnt her brains". Then got tk'ed into a wall again, then was hit in her head wound with a rock, then got bitten by a venomos killik and had half her face melted with its acid and when she killed it it exploded and took off two of her fingers, then got bitten by another poisonous killik and was not only still going but thru it all she put a whoopin on him bad enough to make him run away from her.
She also showed she can block lightning with her saber, was shown to be extremely skilled at combining mele with saber skills, and was able to incorporate force attacks with her saber fighting.-"saba kicked a fist sized stone off the floor, then used the force to hurl it at his head and followed it in with a cut at his knees".
A little while ago i ranked her as a mid level master amongst the njo masters. I think i may have to reconsider my position and bump her up.
Welk, btw, was a One Sith Lord enhanced by the Dark Nest and had the advantage of surprise going into that fight. He managed to wound her there, but he got the worst of it, losing an arm and an eye! Then after she was wounded, he sicked a bunch of Kiliks on her... who she of course killed. And she later commented on how it was the best 'hunt' she ever had!
He and Hamner are the only weak Grandmasters I know of.
The Jedi council was pushing for someone strong to replace Kenth, and her and Horn were their two candidates.
I view her in the same general tier as Horn/Kyle/Mara (that is to say, High Council tier to put it in more general terms).