RATROTTED

Evil/wrong by nature

Irredeemable because of past actions

Deserving of all the suffering in the world

Her and Adora would spend countless years healing and working to right her wrongs. I think the initial getting back together would be the easy part- but then the rebuilding; the diplomacy dinners; the conversations with heads of government would start. Catra in clothes she isn't comfortable in discussing rebuild options for communities she personally oversaw the destruction of. Always having to stand at The Hero's hip during speeches and at parties. She would feel less-than in every conversation with Adora present.

Her past will follow her wherever she goes. Not only because you can't turn off mental illness with a switch, but kids still recoil at her touch when she visits previously Horde-occupied towns.