Goddess Parvati did a very strict penance to get Lord Shiva as her husband for this she spent 1000 years eating just flowers and fruits and the next 100 years eating leafy vegetables and sleeping on floor. Thus depicting that hard efforts that she had put in.
Goddess Parvati performed strict austerity in an open place and brazed through many weathers: scorching summer, winters, storms etc.
According to Hindu Mythology, Goddess Parvati survived only on Bilva leaves and later she even stopped that hence, she was bestowed with name Goddess Brahmacharini.
Goddess Brahmacharini is represented walking bare feet, with just two hand, in one she carries a Jap Mala, and a Kamandal in another hand.
Goddess Brahmacharani is offered prayers on 2nd Day of Navratri.