Nancy,
Could also be the start of neuropathy. So many things can cause pain, numbness, hot/cold sensations and tingling in the legs/feet. Peripheral Neuropathies are a symptom of something else like depletion of nutrients, toxicity from drugs, food intolerances, structural problems, metabolic disorders and the list goes on.
Start by looking at all the meds she is on. All statins for cholesterol can be the cause. Many med deplete nutrient also so find out what meds she’s taking. There could be nerve damage from the diabetes even though she has it under control. There are way to counteract the effects of many of these but it takes time to reverse damage to nerves.
Marlene