Sabrina simply wanted us to let her go because it’s her only way of getting the fresh start. Our presence will always be a constant reminder of the torture she has endured. We will be her painful reminders.
As for the the ending? From my perspective, this story does have one: we were duped. Darren/Clint/Sabrina were all victims of this organization that wanted nothing more than to collect and harvest their precious data. They got what they wanted and now we have been spat out, spared from execution. Same thing goes for Sabrina because as you said, nobody will believe her.