I was pissed off too....but she did it to save her sister. I know i'll do anything to save my loved Ones.
I tend to agree with the quote, "An eye for an eye will leave everyone blind."Yeah thats fair, but you cant blame someone else when he kills you if you brought his/her loved ones in mortal danger due to your decision
even less if it could have been avoided
She definitely did Eliza and MC wrong, but I can understand why she felt she needed to. As such, I didn't kill either of them. Told Selena that if I see her again I'd essentially leave her fate up to Eliza. Felt that was a pretty fair compromise that didn't cause unnecessary death, and returned agency to Eliza.