Gm,first of all you have to find the cause of swelling then only the treatment works ,some other internal factors are also responsible for swelling first get consultation to nearest then decide what to do .it Maye be vascular problem or any other condition , first advice her for gentle movements of leg and elevate the foot while resting.
Next Steps
Get consults if she is having
diabetes or hypertension get proper evaluation with physician
Health Tips
Walking but avoid when it increases during walking if any neurological cause it will harm.