Let's be honest, with the way things are going? Her death is what it's going to come down to.
Mirror is selfish and prone to tantrums, but she wants to get out of here so badly. She wants a real life. That's her driving motivation. And while I will never dismiss all the evil she's done, she's done a little good as well. Yes, she patroned us because she needed our emotions--our positive ones--but she genuinely cares. But that's still bias. . .
[shakes his head]
Mirror likes to bargain, and never breaks a promise. If you can do something for her, especially something that will get her the hell out of here, she will do it. I don't recall you being there, but at her last game--she promised to fix Red if Quartz found out what Scowl was hiding. Obviously that couldn't be agreed to with such vague info, but the point is, if something is going to compromise her escape? You better believe she will focus and do what needs to be done.