Stop asking awkward questions
Part of Chamberlain's RP is that she's found a place to belong in the Republic, and one of the easiest ways to earn citizenship is through military service. They're also a little desperate for good pilots these days with their previous losses and less serious command structure.
You can also consider that factions like the Council, Hellfire Legion and these sorts are or at least were effectively built from defectors, so there's "Disco logic" to fall back on. It depends on the ideological reasons behind it, and from what I remember from months ago it was a messed up operation with civilian deaths that chased her away.
![[Image: emoticon-00107-sweating.gif]](http://www.skype-emoticons.com/images/emoticon-00107-sweating.gif)
