What is the best way to treat a receeding hairline on a 23 year old female?

Could be. Some women are prone to hair loss. Could be genetic but some other things could be ruled out. Sometimes a fungus can cause some hair loss. Dysfunctions of thyroid can also cause hair loss. Check with your physician for a full work up. Otherwise for treatment there is rogaine (minoxidil) and surgery but rule out other things first.