As Mary clings to the wall, she shivers, the air-conditioning causing her increasingly amphibian, ever more tropical body finding the cold unbearable. On instinct, she leaps off of the wall, and right out of her pants, her smaller body slipping out with ease. She pulls her arms in through the sleeves of her shirt and allows herself to slip out of that as well.
She lands on the floor and stands up, barely over a foot tall and very froggish. She has bright blue stripes alongside her chest and her hands and feet are large and bright orange.
Then she does something highly unexpected, even to her - she laughs - it's a throaty, croakish laugh that doesn't at all sound pleasant, at least it wouldn't to a human ear.
"This is... pretty cool!" She says with a laugh, and quickly clamps her arms over her body, the cold of the room becoming nearly painful.