Remember this show is about one thing. The Gibbs character. So the man calling the shots is not the writers, nor the producers, nor CBS. It is Mark Harmon.
If he thinks the "all the women in my life get killed, oh woe is me" storyline is built up with yet another female death, that is what will happen. The fact that there are two more episodes after this with the cryptic titles of "Fallout" and "Date With Destiny" do not bode well for her.
I would put the %ages at this:
Abby dies. 50%.
Abby is reduced to some sort of reduced state and deeply conflicted Gibbs and others mention visiting her at the rest home once or twice a season. 20%
Abby is the target of the hitman and must go into witness protection. 10%
The whole health thing is just to gain ratings, is resolved early in the episode, and she accepts some Abby personality fitting job, freeing her to show up on LA and NO when the ratings sag. 20%
That this has anything to do with Bishop. 0% Dude, let it go.