I need to rewatch this one again, but it certainly looks like Delores' "mind" is shifting between timelines and she can't control it.
In fact, until the last scene, this episode almost looked like it was running backwards for her. She digs up a gun, then she has a gun in her dresser, then she pulls the gun off of the outlaw guy. Seems like the natural order would have been, get the gun, hide it in the house, bury the evidence. To be fair, I didn't notice the details enough to see if this is the same gun, but I assume it is.
Like someone else already said, I think the one committing suicide was its core code saying it couldn't kill a human and overriding whatever part of the code was going haywire.
A few things that jumped out at me:
The part that I was thrown by was the flies around the bodies. Do the bodies actually decompose?
When Rebus said "your boyfriend isn't here to protect you this time," or something to that effect, he was referencing the meeting in the street from earlier in the day, but it seemed to trigger Delores realizing she's gone through this many times before. I just thought that was weird.
I didn't pay enough attention, but I wonder if in regards to Wyatt's men, if only guests can shoot them. I couldn't tell if the girl with them hit any of them or not, but that would be an interesting narrative twist in the park if the hosts could only help you up to a certain point, then you're on your own.