Will Anna's guilt get the best of her?

Anna is already haunted by what she did to Carlos. But she kind of acted like this was something new. I found that hypocritical given what Anna did to Faison. Killing Carlos was nothing compared to that. But I fear Anna may lose her sanity this time around. Between her grief over losing Duke and her guilt over killing Carlos, Anna may not make it.

So again I ask, where is Robin during all of this?