If my understanding is correct with what happened at the last part:
1. some jealous psycho guy is basically, well, jealous of FL and wants her dead
2. rather than die in his hands, she decided to commit suicide instead with the pill
3. I think there's another group that came that's against the jealous psycho
4. the new group starts shooting the psycho group hence the gunfire at the last part...?
5. whoever led the new group values FL and the one that says "you can't die easily like this?"
6. well, for (5), it's either the new group or some "god" who then proceeds to reincarnate her to some world (hence the isekai)
There are still some things I find weird:
1. FL I think basically wants to die, but not in a suicide way. I mean she probably wants to die but not the easy way out, eg. die in the battlefield, instead of simply committing suicide
2. But the reason she still committed suicide in the end is because (1) she's gonna die anyway but (2) just doesn't want it to be under the jealous psycho's hands?
3. (1) and (2) I'm not really sure because it's like very contradictory to me
4. And, yes, too, like others I find it weird that some military guy just shoot the FL in broad daylight and people are just meh. If it was, like, the terrorist who did that, I would've understood.
5. So, in relation to (4), I think that camp is composed of the military/soldiers who had grudge on FL. Hence, they were able to turn a blind eye