A couple episodes ago before the heist when they were talking and he was worried about how it would go, he told her that he'd gone to far in telling Andor a bit too much. I got vibes right then that he'd end up trying to take Andor out after the heist.

I agree on her being more hardened - since we've seen her check him multiple times, essentially reminding him of the plan. Very similar to Cinta telling Val that she was stalling when she didn't want to make the go call during the heist. (When you think about it, her reluctance was likely due to her thinking she may never see Cinta again if she makes that call.)

>I think she’s doing that shit on her own. They way she
>speaks to Luther about everything shows me she’s a more of a
>cutthroat when it goes to this cloak and dagger stuff than he
>is.