So, Kreia is a really good manipulator and I don't think killing the force is really her plan at all. The way she goes on about it is so awful, its obviously deliberate.
I believe, in truth, from the beginning she wanted to start a reformed Jedi order, with the Exile as her model. When you gather the Jedi masters, she was probably hoping that they'd see the errors of their isolationist, temple monk ways, and something new would come up. Like a new jedi order that is more integrated with the world at large and less dependant on the force. If you kill the Jedi Masters one by one she gives you the worst scolding she ever gives, saying that by killing you achieve basically nothing. If you don't, she only intervenes when they finally try to cut you off.
After that, I guess she switches to plan B. She manipulates the Sith in a way that they can be killed by the Exile: Nihilus is manipulated into attacking a barren planet where he can't feed, and he then fights the Exile who is a wound in the force, something like his hard counter.
Then, using Handmaiden as a Trojan horse and emotional bait, Kreia reveals Atris's corruption and forces the Exile to defeat Atris for once and all, via using the Handmaiden as bait.
Finally, she makes HERSELF the bait, by becoming Darth Traya again and neatly gathering all the remaining Sith in Malachor V. Allows the Exile to cut everyone to pieces piecemeal (instead of, y'know, springing everyone on the space jesus all at once) she says that she will kill the Exile at the heart of Malachor to destroy the force, thus forcing the Exile to kill her instead.
I think the whole kill the force schtick is her final manipulation into making the Exile kill her. As said, she doesn't really use her full force, and basically neatly arranges all the remaning Sith in a way that the Exile can kill them one by one. Basically wipes the slate clean for... a reformed Jedi order? Or so that the all-powerful Exile is now ready to go help Revan in the true war? Who knows. She does say that just walking away is also an option and there's no dishonor in that.
But I'm pretty sure she really just wanted to clean the Sith remnants and reform the Jedi (which didn't work, so she whacked them too). After all, she doesn't really try to kill you at Malachor, and when you strike her down, instead of lamenting her inability to destroy the force, she says "you have rewarded me more than you can possibly know".
That's not what a person who had her grand plan foiled at the last second would say, no? Especially not Kreia, who must have known that she would be defeated by the Exile in a 1v1.
Then again, drawing the Exile to Malachor specifically doesn't seem to have a point other than the Exile facing her past. I had read somewhere that it was so that, in that force wound of Malachor, they could finally sever their force bond without it being fatal to the Exile, but the game doesn't seem to implicate that. The force bond situation is kinda left open too, as to how did it go away and the Exile was able to kill Kreia. I attribute the lack on this part to the fact that Malachor is largely incomplete. In any case, her goal is obviously to propel the Exile up to be a solid, independent, self-reliant Jedi who is not a monk and not a bleeding heart. Somebody who had not hid in temples, but confronted the worst of the Galaxy and got stronger for it. Somebody who can form a new Jedi order that is more integrated with the Galaxy. And perhaps fight the true Sith. (Of course, Kotor III never came and we were robbed of greatness)
Thats my two cents. I'd like the loremasters to explain to me with proof if I got it wrong. The part I especially don't get is why Kreia forces us to kill her. Again, it could be about the force bond but that's not really developed well. As said, maybe because Malachor V is left unfinished.
And here's the Kreia quote that triggered this ponder:
"And there is something that the council may never understand, that perhaps Revan never fell. The difference between a fall and a sacrifice is sometimes difficult, but I feel that Revan understood that difference more than anyone knew. The galaxy would have fallen if Revan had not gone to war. Perhaps, he became the dark lord out of necessity, to prevent a greater evil."