You wave goodbye, and make your way up to T'Chia's house, which is large. Luckily, with all of her intelligence, Gala-Roz made a staircase straight to the roof of the thing, so you can latch onto the platform with ease and climb up to her fourth gate. In your ill state, you shouldn't be using your powers much.
You ascend to the fourth gate, and wave goodbye to the tiny specks that comprise T'Chia and Jatnip.
T'CHIA: And one thing too!!!
T'CHIA: If I can find a cure, I'll let you know!!!!