Lila did a vrata for pleasing Saraswathi. Fewer details have been given in Yoga Vasista regarding the fasting rules of the vrata. The relevant excerpts regarding fasting rules are given below
Having determined so, she betook herself to observe the strict ceremonials of the Sastra, and without the knowledge of her lord. She kept her fasts, and broke them at the end of every third night;and then entertained the gods, Brahmans, the priests and holy people, with feasts and due honours. She was then employed in the performance of her daily ablutions, in her act of alms-giving, in the observance of her austerities and in meditation; in all of which she was painstaking, an observant of the rules of pious theism. She attended also to her incognizant husband at stated times, and ministered unto him to the utmost, her duties as required by law and usage. Thus observant of her vows, the young princess passed a hundred of her trinoctial ceremony, with resolute and persevering pains-taking and unfailing austerities.
I want to know more details regarding fasting rules of the vrata followed by Lila from any other scriptures especially smritis if possible.