I had started to write advice to you on all your questions but have changed my mind. A 100g hoglet is really quite small to have left mum and I would strongly recommend that you contact your nearest carer and get it looked over. You also need to get a poo sample checked – either with your local carer or through Vale wildlife hospital.
Seemingly healthy juveniles can suddenly go down hill and die so it’s worth getting this done
I would suggest that you ask your carer to look after it until they can assure you it’s out of danger at which point you could take it back to overwinter.