
sounds like the yorkie is winning!!!!
I think you have to take the bull by the horns and either grit your teeth & continue ignoring it until she finally gives up, (no more one night relapses, you must be constant.)
Or, give up, accept she will sleep in your bedroom & call it a daY!
One other thought, how about a clock radio downstairs that comes on automatically at about the time she usually starts barking? It might just be enough for her?