It happens with some medical conditions and it's due to the core being prioritized over the peripheries.
I would suggest fuzzy socks. a thick blanket, fingerless gloves and thermal clothing if you don't want to put the heating on.
I bought my sister these ones:
Fight the chill by layering thermal underwear for women beneath your cold weather outfits. Shop our full selection of cosy base layers at M&S
www.marksandspencer.com
With extra warmth, these thermal ankle socks will ensure your feet always stay cosy. Made from Sumptuously Soft™ fabric for ultimate comfort, with added stretch for a flexible fit. Multipack comes with three assorted colours, each featuring a twist cable design.
www.marksandspencer.com