Yes

Characters sizes

Davey: 5'3, 94 pounds
Ashley: 5'07, 128 pounds
Naomie: 5'07, 126 pounds
Diana: 5'07, 130 pounds
Maria: 5'05, 120 pounds
Himiko: 4'11, 100 pounds
Amber: 5'06, 124 pounds
Anna: 5'10, 140 pounds
Ava: 5'09, 129 pounds

At the break Ava, me, Anna and Himiko go to cafeteria to drink some juice.

Ava: 5'06, 124 pounds

Ava shrinking right Infront of our eyes. As she shrinks I notice a glow from the stone in her pocket. Himiko, who follows us l, also noticed it because she grabbed the stone and runs. After that Ava's pants fell off and she run to the locker room with the teacher, who was nearby.

"What a day!" Anna says and looking down at my eyes.

"Yea right, the giant girl is now just average size!! I have a beautiful girlfriend