Artsy french student film from Goeblins with some beautiful imagery if you like colorful 2D. It's about three people who disembark an elevator in a series of fantasy lands. Then one, apparently an aging short blonde, eats some berries and starts expanding. Then she gets stuck in some trees and springs a leak.
Expansion starts here:
https://youtu.be/y27YW2WHXWs?t=118