Hi thanks for the query.
First I would like to know the age of your cousin. Just the pain in the calf does not necessarily means clot in the blood vessels . Since she does not have any swelling or warmth or redness
, try to visit local physician who can prescribe you basic analgesics and some local pain relieving gel. Most of the time it could be due to long sitting posture. Taking aspirin
acts like pain killer and also to prevent clots in the blood vessels.