yknow, in the end(the next time you meet capitan after tavi being reduced to a slave) capitan gives you a choice, one of which leads you to escape with tavi, but then you can return in a dream
have you installed the new update ? and if you have: you need to either completely break her or fix her, then you can plan to escape again and this time you actually manage to escape (or you become the Captain's snitch)