The funny thing is that the Prince is actually right about Celestine being a good person. She doesn't believe it herself, but she could have just run off like her brother and got by fine with her sword skills elsewhere. Instead she lives like a pauper in order to try to help out her father. No matter how dangerous she feels like things are getting, she refuses to abandon her last family member, and it's pretty sweet. I'm glad the Prince can see it.
Here's hoping he recruits her already and doesn't get caught up in whatever ridiculous trick she's about to pull.