She read further into the second variation.
It explained that before she would be capable of growing, she would need energy, and to do this she would need to eat one person whole. After that, she would grow, and the more she ate, the more she would grow...
This greatly excited Gwen, and she revelled at the thought of being able to grow to the size of an entire city...no, an entire country...or even bigger!
She grinned maliciously, and peered out the window. Her idiot of a brother had just mopped the floor with a rogue teenager carrying a gun, and the Omnitrix had just timed out.

"Hah, yeah! Another victory for Ben 10!" He yelled. Gwen surged with a secret jealousy...she had always felt like the sidekick, the unimportant one. But now was her time for revenge.
And revenge is a dish best served with a side of Ben.