barmyoldbat I wonder if something like a heated throw would help. I know they are not cheap but maybe you could try one now then buy another if it works well. Also wonder if it might make a good Christmas present for you daughter as she might feel better about heating just herself rather than a whole house.
www.lakeland.co.uk/61802/Velvety-Electric-Heated-Throw-Grey-and-Red-Check-%E2%80%93-135-x-180cm
Hooe this link works they do have cheaper ones.
Do you feel no-one listens ro you?
a note of caution if you use mouth wash
Locked room for breakables when grandkids stay?



