I was thinking about this the other day for some reason and the KoToR comics are not really all that clear on how Krynda died. I see two possibilities.... The first would be that Haazen did something nefarious to get her out of his way....poisoning...some Sith Alchemy...some unknown force power... The second would be that her suspicion that her Son and four favorite students cut down their apprentices in cold blood caused her to "lose the will to live" or something of the sort. It almost seems like that as she mentions that her health started to decline after her visions of the Padawan Massacre but it very well could have been that Haazen capitalized on that moment because she was disturbed and had left her guard down. I apologize if this has been discussed before. I don't remember seeing any talk of this.