"What happens in her world is beyond your control, so you should not feel like a failure. You are protecting her in this world, are you not? That is not being a failure. No one can control the Seal no matter how much we may wish it to be otherwise." Mara also knew that if she was ever sent back to their world, all that awaited her there was death. There was no doubt in her mind that because of that, Luke had similar thoughts to what Galen was having now.
"We all have our own codes to live by, and honoring a debt I believe is rather universal to us all. I can respect that she had a debt to pay. The only thing I would take issue with is if she directly caused harm to someone. But if others try to go after her, you should ensure her safety so that she can at least tell her side of the story." There was always more than one side to every story, and Gaia undoubtedly had her own. Mara would not actively go after the woman, but she couldn't be sure about others, especially to those who were directly harmed by Gaia's actions.