Try and get a cheap hairdryer , plug it in next to the Viv.
Wait until evening Wait until it's settled under a hide .
Have the thawed mouse ready in tongs ... hot blast for 10 to 15 seconds then INSTANTLY dangle the mouse in front of the hide entrance ....they usually take it under first time but yours may take 6 or 7 attempts . If there is any interest shown , even a tongue flicker then that's your cue to keep trying ...
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