God she is fine
I don't think she'll die. I see an opportunity for Kaneki to possibly bring her and the other guy aboard his thing. I think that there's a significant portion of the CCG that would be revolted if they learned the truth. I'm not saying that Kaneki would try to grab everybody and turn them to his side, but Kiyoko is a tremendous asset. Not to mention that she could very well be important to Akira, who Kaneki views as a mother figure. Kiyoko and Akira's mom graduated from the academy together, it's feasible that she had a relationship with Akira.
Wait, where did you find out about Kiyoko having graduated from the same college as her mom? I must have totally skipped that part. So if they both graduated at the same time, that means Kiyoko is already in her forties 
? Wtf? I wanna look like that when I'm hitting that age 
Honestly, I don't see any relevance in Kiyoko simply b/c she hasn't really been characterized a lot up till now. Knowing Ishida though, any background character can be elevated to an important supporting character later on. But since she's pretty much the strongest woman in CCG and CCG's entire leadership is out of control right now, she and her special class ghouls investigator colleagues are gonna become more important from now on. Before Akira, there's also her nephew Shinsanpei, whom she loves dearly. Now if something happened to him...
Kidding kidding XD
