I have this idea... but not too sure if it will work for you. This is a technique I used with my ball python when he refused to eat, and I've offered it to others who have had non-eaters (ball pythons) with success. Now my ball python knows the routine every time, and as soon as the rat is on the tongs and the lid is open, he comes flying out!
First, I take the full thawed prey and put it in HOT water (inside of a baggie, with the baggie open and folded around a cup of the hot water so the mouse doesn't get wet) and place it beside the vive for 10-15 minutes to scent the air - maybe less if the mouse is small, as to not cook it.
I then turn out all lights except one in a far corner so I can see. I open the lid quietly, and take the prey in tongs. I jiggle the prey just a little, on the opposite end of the vive from where the snake is (so they know it's there, can smell it, but is not too close to frighten them). I wait a minute to see if they show interest, pop their head out of a vive, etc. When they notice, put the prey a little closer, until about 6" from them, in view. Then I do a bit of jiggling (some call this the "zombie dance"). I wait for the snake to come closer - I do NOT put the prey closer to them at this point, but allow them to move in. I kind of tease them with it, slightly pulling away when they inch closer.
Eventually they strike.
Now, for ball pythons, they would strike and coil it at this point, in which I would give the prey another little jiggle to get them to coil tighter.
I think you could do something similar with yours, if this tactic works. Even just giving it a little nudge so the snake strikes again.
I hope that this will at least give you some ideas to try out, if nothing else.