Horsfield hibernation question

[Maddy]

hi everyone
I'd like advice and opinions on my following dilemma.
Last year my smallest horsfield disappeared in September, I honestly thought she'd escaped, been taken by a bird or stolen, we searched and dug very extensively. However on a sunny day in April she appeared as a ball of mud in the garden!
This year she has done the same, I know (roughly) where she is. So, do I dig her up when I put my others in the fridge in a few weeks or leave her? I live in Derbyshire and it was a mild winter here last year. She's under a huge piece of thick Cornish slate, but has no other protection.
My instinct is to dig her up and pop her straight in the fridge, but do I do it now or wait until the others go in. It's currently very wet here.
Many thanks
Maddy