Any sort of burning sensation, numbness, pain without any injury or specific pathology be it after a stroke of central nervous system
like the brain or due to reasons like peripheral nerve
impingement (compression) shows an inability of the nervous system to transmitt proper response of sensations to the brain.
Painkillers is not the absolut solution. As she had weakness causing disability which is now recovered it seems more or less a residual symptom of a stroke.
If medications have not been effective, I would like you to try Sensory Re-education therapy done by a Physical Therapist involving different tecniques of electrotherapy
and exercise therapy
combined with oral nutritional supplementation for the nerves.
Hoping it helpes.
Orthopaedic & Neurological
Lifestyle Medicine Counsellor