She picked it up and saw that there was money inside and credit cards.
However, instead of taking the cash, she decided to do the right thing.
She tracked down the owner who was visiting the Key City from Lamesa, a town near Midland and mailed the wallet back along with a kind letter.
The owner, Laura Rubio, was so touched, she posted a picture of the letter on Facebook.
Now, hundreds of people around the U.S. have shared it and have been impacted by one girl's good deed.
Her parents say they couldn't be any prouder and Rubio says she plans on returning to Abilene to personally thank Abbie.