Sounds ok to me, just a few ideas >:3
OK so when they come to the Main camp, the others are captured and "re-located" to the normal cages, (so not where samala is) and Bailey is set free because she is Elizabeth's companion. Frantic about Magno, she refuses to leave and eventually is forced to. She goes to Elizabeth, tells her about the Main camp's cruelty or sth, and gets her to do something.
Once they escape......
Since Kurith and Kithea ha- dislike (lol) humans, maybe they would think Arwen was a human? And then Samala decided to keep Arwen a sectet, and hide her in her wings. One night, maybe Bailey could smell her (because of her nose) and find Arwen? The others wouldn't notice, because Samala would have rubbed a bunch of herbs onto Arwen's skin to hide her skin to hide her scent.))