She sounds absolutely delightful! I wish I could come too!
I also do not feel the cold and although I am pretty unwell/disabled in quite a number of ways, I too sleep in the depths of winter (I sleep in the kitchen bizarrely in a riser recliner as I am so much more comfortable than in a bed) with my door open, and like her, do not get colds or flu at all, not for over a decade now - last winter there seemed to be a very nasty viral thing that went around flattening everyone, except me! If I thought about it hard enough I could have had a very mild sniffle whilst all around me were moaning and groaning! Reminiscent of those TB hospitals where they were all out in their beds on the verandahs in all weathers!
I agree with not getting stuff that uses electricity, but a trip to an 'outdoorsy' type of shop and I reckon you will find plenty of ideas - yes you can change the address on Amazon, so get your stuff online and send it to yourself at her house .... jib done and have a smashing time! xx