When Sri Ramanujacharya stayed in Tirupati for one year, milk, curd and ghee was supplied by Thumbimaankondi. Once, Sri Ramanujacharya called her to his place to pay her money for milk, curd and ghee for the whole year. To the surprise of Sri Ramanujacharya, Thumbimankondi did not take the money instead she asked Sri Ramanujacharya to give her moksha or liberation.
Sri Ramanujacharya asked her who told her that he can provide moksha to her.
An innocent Thumbimankondi told Sri Ramanujacharya that if he gave a letter of recommendation to Srinivasa (Venkateswara) she would get moksha.
Sri Ramanujacharya wanted to know what he should write in the letter.
She told that he should write so powerfully and intensely that she be granted moksha.
Sri Ramanujacharya then wanted to know if he indeed write such a letter what will she do with it.
Thumbimankondi told Sri Ramanujacharya that she would climb the Tirumala hills with the letter and then present the letter to Lord Venkateshwara worshipped in the Tirupati temple.
Sri Ramanujacharya was happy and decided to reward her confidence and devotion with a recommendation letter.
Sri Ramanujacharya wrote that Thumbimankondi had single-minded and unwavering devotion and performed selfless service to Bhagavan. So I request you to give her moksha.
Thumbimankondi took the letter, climbed the hill and sat in the temple. She held the letter and waited before the temple without eating food or sleeping.
Srihari Venkateswara was so impressed with her single-minded focus and devotion that he appeared before her and took her to Vaikunta.