Xilizhra wrote...
I hope that she can reclaim her old life. If not, I'll always wonder if I could have given Morinth a new one.
Well-written characters, like real-life humans, never go back to their "old life"; simply because it is gone. Life-changing events are one way streets.
If you hope Samara will "return to civilian life", nothing in the canon seems to explicitely prevent it. But looking at her attitude and comments, I get the feeling that she will die a Justicar:
1) We know Justicars follow a Code aiming at a) "Punishing the Unjust" and

"Protecting the Innocent".
2) We know that Samara acts as if

takes precedence over a), from the Nihlus incident. It is unclear if this precedence is part and parcel of the Code or if Samara chose herself.
3) We know Samara felt it important to deal with Morinth before going on the suicide mission.
4) We know Samara understands that Justicars tend to die violently and ackowledges this as her own likely fate.
5) We know Morinth's death, while bringing her closure, also brought her untold sadness and regret.
I believe Samara feels Morinth's actions are her responsibility, in spite of the fact that Morinth is obviously an adult (mental illness notwithstanding). Blame it on an overly emotional sense of maternal responsibility if you will. I believe Samara loved her daughter, otherwise she would not have cared so much about Morinth's actions. It would have been easy to write her off as "hopeless" and let the authorities handle it. Lots of parents give up on their addicted kids, "disowning" them and dumping them into society's lap...
When I look at it, Samara loved her three daughters profoundly. Their condition is incurable and 2 of them accepted seclusion while one decided to run. The one that ran is irredeemably addicted to killing her mates and she's likely mating fairly regularly (Nef was killed mere days after Morinth's arrival on Omega). Only death will stop her from doing so.
Had Samara given up on her addicted daughter, she couldn't have cared much about who would kill her. Perhaps she wouldn't have cared if she lived on. But for some reason of her own, she made it a point to stop Morinth herself, something she was quite able to do given her past mercenary training and remarkable biotic powers.
I think the only reason for her to join the Justicar Order was that her love of Morinth might have kept her from "pulling the trigger" when the time finally came. The Code gave her the resolve she needed to "pull the trigger"...
With Morinth now dead, her remaining daughters and life mate lost to her, she cuts a sad figure. She denies herself an opportunity at a new beginning with Shepard, in spite of the emotions Shepard stirred in her. That tells me that Samara was perhaps expecting to meet her end on the Collector Base and that prospect was peacefully accepted, if not actually welcomed...
While I don't see post-Collector Base Samara as a suicidal person, I certainly see her as resolutely embracing the Justicar path (and its likely violent end) as she no longer has anything to hold on to life for. That being said, it's not impossible that life (and possibly Shepard) might change her perspective; that's something I would expect to take time, though.