Shakti

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The reason for Shri Radha’s appearance on Earth, according to the book ‘Glories And Pastimes of Shrimati Radharani’, was because she was cursed by Shridhama since she became angry on Shri Krishna as he had gone to meet Viraja.

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Shridama was a close friend of Krishna and he cursed Radha for being angry on the Lord like ordinary human.

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In his  'Shri Lalita Madhava’, Shrila Rupa Goswami 

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relates the appearance of Shrimati Radharani as explained by Purnamasi Devi to Gargi, the daughter of Garga Muni. The details of this appearance were known to Purnamasi Devi, as she arranges all the pastimes of the Lord, and she shared this information only with Mother Yashoda and Rohini Devi.

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Vindhya Parvata was envious of the Great Himalaya Mountains, because Himalaya, having Parvati as his daughter, had the opportunity to get Lord Mahadeva as his son-in-law.

Vindhya parvata had the desire to have a fortunate daughter whose husband could defeat Mahadeva in fighting, and who would thus attain the position of Rajendra (Emperor).

Vindhya parvata performed severe austerity to please Brahma. At last,Brahma appeared and gave him his desired boon but thought to himself that who is that person who could defeat Mahadeva?

Then he realized that Lord Krishna’s Pastimes was going to take place on the earth: only he could defeat Mahadeva in battle and eternal consort of Krishna is Radharani and if Vindhya parvata gets Radha as his Daughter then his boon would be justified.

Thus Brahma requested Radha to keep his boon by becoming the daughter of Vindhya Parvata and Radharani agreed.

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In the meantime Lord Krishna had taken birth and Vasudev had exchanged Krishna with Yogmaya (Durga) in the form of a baby girl.

Kamsa came furiously to kill the baby girl but the girl escaped from his hand and appeared in her form as Yogmaya Devi.

She declared loudly, “Kamsa! The Lord has appeared on the Earth to give pleasure to all the living entities and to kill you. 

Along with him, eight Maha-Shakti-greater and more attractive than me-will also take birth on the earth. Their names are 

1. Radha, 
2. Chandravali, 
3. Lalita, 
4. Visakha, 
5. Padma, 
6. Saibya, 
7. Syamala and 
8. Bhadra.

Whoever marries them will be most fortunate: he will be Rajendra(Emperor), and will be so powerful that he will defeat even Mahadeva in battle.”

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Also

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