In ABC v. The State (NCT of Delhi) 2015, the Supreme Court has held that

The mother of a child born outside of wedlock, cannot be assigned guardianship.

The mother of a child born outside of wedlock, can be assigned guardianship only after determining identity of the father.

The mother of a child born outside of wedlock, can be assigned guardianship only with the consent of her parents.

The Guardians and Wards Act, 1890, does not necessarily require notice to be sent to the unwilling father and therefore the mother of a child born outside of wedlock can be bestowed guardianship.