What is the ruling on using a therapeutic method for warts that involves counting them, mentioning the mother's name, then burying grains (wheat or barley) equal to their number in an eggplant and burying it in the ground, knowing that the female healer prays, fasts, performs Hajj, and does not take payment? Is this considered magic and sorcery?

Allah has prescribed healing through two means: a sensory and empirical way (medicine), and a religious way through the Qur’an and beneficial incantations (ruqya). Anything outside these two paths is charlatanism and sorcery, even if the perpetrator does not charge a fee or maintains prayer and fasting, as this could be deception or ignorance. And the fact that healing may sometimes occur through such means does not justify seeking their help, for it could be a test, a coincidence, or reliance on jinn.

The woman mentioned in the question treats people using forbidden, innovative methods, such as knowing the mother's name, and using eggplants and wheat grains. This is charlatanism and a lie against both religious law and reality. She must be advised and warned against, along with others like her, for resorting to them is a breach of religion and a deviation from the guidance of the Prophet (peace be upon him). Those who have gone to her must offer sincere repentance. Muslims should acquire beneficial knowledge to block avenues of evil.