The website Regionlimaaldia.com [es] shares the story [es] of 9-year old Tatiana, who:

[...] didn't hesitate and got her long hair chopped and sold it in order to buy medicines for her mother, who suffers of hypertiroidism that has caused her a tumor located on her neck.

In spite of her sacrifice, Tatiana wasn't able to buy all the necessary medicines, so she asked for help.