For the ability of herbs to cure, it is not unusual for them to be attributed to supernatural sources, and so since the Celts worshipped the earth as their mother, then it is understandable that the female goddess is worshipped and held in reverence, probably represented by the Legend.
Such practices can still be found today in the cultures of ancient peoples, such as followers of the Bon tradition in Tibet and the Australian Aboriginals where the women would worship the spirit of the water, at lakesides and rivers where childbirth was common, bringing offerings of bread and cakes for the water nymphs. In contrast, the men would worship at mountain peaks and address the spirits of the heavens.