Again I am holding my judgement, I think she is okay, but time will tell.
Same. It's clear from the look on her face - and Troy's too at some points - that there's more to this. Bonnie looks afraid most of the time and her voice wavers a tiny bit. It feels like Carver's forced her into something, testing her loyalty perhaps, using someone she knows well against her. Probably the same with Troy (might be too afraid to even say anything), but not Johnny, who was a bit of an overconfident asshole, probably one of Carver's more trusted allies.
Carver needs more manpower than he has, so he finds people who come in twos (i.e Shel and Becca) and threatens one, telling them that the other will get hurt if they don't do what he says, and when he leaves the camp he tells his more loyal goons to keep hold of the person he's threatening to hurt so that the other doesn't run off. He probably makes himself out to be some sort of invincible god to his prisoners, making them less likely to try and shoot him.
I am with you there. I never trusted her in 400 days, so there is no chance I will give her any leeway in the forthcoming episodes. If a chance becomes available for me to do away with Bonnie, then I am afraid it's the salt lick for her.