If she ask you to give her good release letter, you should say if she have good performance in this month, you will give her later. (Of course Pretend)
Ideally, you state you mobile phone no. in the release letter, you can say the true if any potential employer call you.
Remember - You must check you property before she leave your home. Report to Police if you have anything lost.
I found that post the black list in baby kindom or immgration dept is not so effective.