1 tenant moved out, the other can't afford the rent

[Josh Hinkle]

Boyfriend/girlfriend signed a least together in May.  They broke up a few weeks ago and the male has disappeared.  He won't communicate with me at all.  The female says he won't talk to her either.  She tells me he's been gone for 17 days. She has requested to change the locks because she doesn't want him in the house when she isn't there.  I refused to do that.  She would not financially qualify for the house on her own and she is telling me it is going to be hard for her to make the full payment.  I want to work with her to get her in a place that she can afford and get tenants in that can make the rent ASAP.  My question is if she and I sign a release to end the lease, but he doesn't sign it, can I take possession of the house when she moves out without evicting him?  I have a 10 day property abandonment clause in the lease.  So, far she has been very good at communicating and has never been evicted.  Any advise would be appreciated.  This property is in Kentucky.