This is best solution. One of my "mousers" was easily converted to FT rats. Try feeding at night. Try leaving the room, and wait a few weeks before next feed. Then try zombie dance. If all that fails, give her the the mouse and have a small frozen rat available for piggy back feed. After the 1st mouse is 80% in, gently put the nose of the FT rat behind the butt of the disappearing mouse. Her swallowing reflex will have her to continue eating the rat. Eventually she will get the "taste" of rat, and take only rats.