They are listening OR you could get them a hearing aid.
I assume that there are no underlying diseases such as diabetes.
IF......your mother's symptoms are due to poor circulation, then one would have to go down the route of arterial ultrasound and angiograms and if your thoughts of bad circulation are indeed confirmed, then quite major arterial bypass grafting.
No creams.....no tablets.......no injections will help.
Do you feel that your 81 year old mum could stand such surgical intrusion?