"Only this," said Cindy. She then concentrated and she began to grow a little. She grew up to Gwen's former height and Gwen stared in amazement. She was even lost for words. She rubbed her eyes.
"Are my eyes going now?" asked Gwen.
"No silly I grew just like you," replied Cindy.
"But when?"
"Well after I shrunk to nothing and grew back up I felt something go in my body. I tried to grow and this time it was a piece of cake. Except I hit my head on the ceiling and it really hurt me."
"Well you'll get use to that."
Cindy then shrank down to her normal height. Gwen was a little surprised about this. She looked over to Cindy.
"You're still shrinking yourself to normal," she said.
"Yeah," replied Cindy.
"Well you can become whatever height you want. Why go back to your normal short height."
"It's a little like you. I got use to being short while you got use to being extremely tall."

What happens next?