Thanks for the query to H.C..M. Forum.
This type of swelling is known as edema ( pitting type) .
This occurs over dependent parts as feet ,ankle lower part of legs and lower parts of hand fingers .
The reasons are many particularly in this case as she is chronic patient of hypertension
Congestive heart failure
, chronic renal failure
, are the most important cause to rule out.
anemia are less common cause.
She was feeling hot in spite of the cold means thyroid
Consult a physician and get his opinion and all relevant tests.