The Bala Yakshini is said to the Shakti form of Chandrama or the Moon. The Mantra Sadhana of the Bala Yakshini is said to give the most miraculous results as she is said to a Goddess of the highest class.
The Mantra Sadhana is performed by sitting on top of a Peak of a Mountain and chanting the Mantra given in this post 100,000 times in order to gain Mastery over the Bala Yakshini Mantra.
The Bala Yakshini is then invoked on the day of Puranmashi [Full Moon] by lighting a Ghee Diya [Lamp filled with Clarified Butter] and sitting before it and chanting the Mantra throughout the night.
Then when the Devi appears before the Sadhaka, the Sadhaka should offer Argya of Raktchandana and address her thus “Become my wife”. The Devi then becomes the wife of the Sadhaka and gives him Bhog [All Kinds of Thrills and Pleasure, including Physical] and Divya Rasayan [Magical Items], which enable the Sadhaka to live for 1000 years.
The Bala Yakshini is the fruits of the worship of many great Sadhakas, Yogis and Yugpurush who have lived in the Caves of the Himalayas for hundreds of years and enjoyed Heavenly Pleasures on Earth.
Hindi text sent by Kapil Pramanick
Bidhi- Bala yakshini (Chandrama) ki shakti swarupini hai. Yeah atyant vismaykari evam sabse Uttam koti ki devi hai.
Iski sadhna parvat sikhar par baithkar ki jati hai. Ukt mantra ek lakh jaap karne se sidhdhi prapt hoti
Purnmasa me din ghee ka Deepak jaalakar raatbhar jaap karne par yeh devi prasanna hoti hai.
Jab devi aaye to use rakt-chandan she Argya dena chahiye. Us samay sadhak ko yeah kehna chahiye ki 'tum hamari bharya ban jao.' Tab woh uski bharya bankar bhog tatha Divya rasayan pradan karti hai. Isse sadhak ek haazar barsh(years) tak jeevet rehta hai.
Yeh devi Bade-Bade yug-purush evam mahan sadhako ki aradhya hai.
Himalay ki gufao me aaj bhi saikro aise sadhak jiveet hai jo nitya swarg sukh ka bhog karta hai.
Om Shreem Shasidevyagch-Gch Swaha ||
ॐ श्रीं शसिदेव्यागछ-गछ स्वाहा ||