While her strength is not the same as Luisa’s super human strength, she is still strong enough to carry in an armchair over to a mirror so Aang can use as a makeshift ladder out of the Mirror World. When she gets nearer to the mirror, she gets ready to push it towards it as swiftly as she could.

“Okay, on three. One, two, three!”

And so begins the armchair pushing towards the mirror with her heaving the chair towards Aang in his current location in the mirror dimension via the mirror itself. It is a bit of a slow process with how heavy the chair is but she is going to push it as hard as she can to get it to where she needs it to be.