Welcome to Healthcare Magic
When a person is lying in bed in one position for a long time she will bound to get pressure ulcers
on her bony regions of skin pressure. Make sure to turn her to different positions every half to one hour to prevent deep unhealing ulcers from forming. Also see that she is not wearing wet clothes or lying on wet bed sheets. You can get her a water bed which is quite good to prevent pressure sores
. The severe body pains could be there if a certain part of brain called Thalamus is damaged. If she is diabetic her blood sugar must be controlled well. Since she is in her 80s she is probably having dementia
which is why she is confused, but could also point to severe infection which can make a person confused suddenly like sepsis
. Better to get her admitted and do a full work up without taking chances. She needs a Nurse to help her in the house for her comfort.