Tink understood medical, and nodded at her friend, "Oh. Is that easy?" She inquired, before beginning to dig deeper into the lunch provided for her by Enigma.
Tink hadnt been exposed to too much in Neverland. If she had questions, Peter would answer them based on what he knew she would understand. Peter knew much more about the world outside of Neverland, where Wendy and the Darling's came from (and the place Peter himself had left Neverland to live in). Tink often didn't understand the things about the world, but slowly she was learning.