Hi.. What your mother is having is called as Calcaneal Spur or Padakantaka in ayurveda.
There is plenty of medications available in ayurveda for this .She must be given Vatahara treatment which is naturally available in ayurveda.
She can apply any ayurvedic medicated oil such as Nirgundi thaila or Maha narayana thaila etc to get relief from pain along with other medications which any ayurvedic doctor can provide
Please consult for proper treatment and better results
Take care
Next Steps
Use very soft footware .
Avoid walking barefoot inside house during winter .
Do calf muscle and foot muscle exercises coz strong muscle acts as cushion and avoid pressure on Calcaneal bone.
Health Tips
Avoid long standing and long walks.
Immerse foot in warm water.
Use light weight footware .
Have easily digestible food.