Go to Big5 and buy the body warmers (man-hand size) and put one in a sock under her blankets. They do get quit hot but they last for up to 10 hours. The smaller warmers only last for 2-3 hrs and are palm-size. The microwave gel only last for about 1/2 hr. Be sure to put the sock where they can't get at it because the granules inside can be harmful if swallowed. The body warmers are what I've always used for myself because I was a snow skier and we all know about those because they work and I use them now for Muffin.
