You have been with Toph and the Gaang since the start. Toph has been setting up her tent near her metal-bending academy which she created not long after the hundred-year war against Firelord Ozai

It's been 3 years, she is now 15 years old. You opened her tent and went inside, she then detects you using her seismic sense

"Oh, it's you." She said, on her bed while playing with metal, manipulating it to shapeshift into different physical forms. She didn't even bother to look at you. "What?"