This is what I would do. Wait three days after your last attempt. Thaw the pinky in very hot water- 101-103F. Cut four small slits in the back of the pinky, just through the skin. Put the snake in a small container, with air holes, just big enough to fit the snake- like the size of one of its hides- with the pinky, in the evening, in the dark, and leave it alone for at least two hours before checking on it. If the snake hasn't eaten the pinky, leave it in the container all night.
Nanci