Yes, I think that this episode is the RQ’s back-story.
I hope so, because without Ana-centric flashbacks, it would be a Will-less episode, and that would make me sad.
The way RQ closes her eyes at the end, when it looks like Alice is gonna slice her up, could that be one of those, “We can work together to screw over the 3rd party, but they need to believe we’d never work together, so you need to cut me so I can show them,” type situations?