If you have a two storey house it should be not much of a privacy issue - correct me if wrong there.
As for what to do after "working" hours, difficult to tell but it's true that most work at least until 9 or 9.30 since many will clean up the dishes after diner, take out the garbadge and in some cases, put the kids to bed (I said SOME cases).
But I am sure if you allow her NOT to work after say, 8 PM and if she has her own TV, Internet Access and so on and so forth she will be able to take care of herself: ie take shower, e-mail with friends, Facebook, watch a little movie...