hello there.
as you have mentioned the age as 56 years, she should have attained menopause by now.
therefore the irregular periods.
for the swelling of the legs get her blood pressure, blood
sugar and ECG done once so that the cause of it can be established. Take treatment for hypertension.
it is a vascular problem rather than a neurological problem.
kindly revert with reports or consult a general physician with reports.
best regards.