I think Rachel... (ep7 spoiler)
...should have blasted Atika,too. She'd been playing the whole family for donkey's years, coldly led Ephra to his death and was obviously complicit in the kidnap and the plot to blow up Nessa.
Then again, I think she needed to survive for a big Nessa/Atika closure scene in the last ep.
One thing maybe someone can help me with: after Rachel shot scarface, Atika held the barrel of the shotgun up to his cheek and said: "You shouldn't have raped her." If this wasn't part of the plan, what was the plan? Atika looked like she knew he was going to come into the cell looking back on episode 4; if not to rape Nessa, why?
But at least this clears up why, although she was up to her neck in it all, she did look genuinely distraught whilst the rape was in progress.