In 2014, Hailey's mother, Yong Dawson, asked officials at the University of Nevada Las Vegas if they could build her daughter a hand so she could ride a bike, WGN reported.
But that was only the first obstacle Hailey tackled. She wanted to start raising awareness of Poland syndrome, and to do that, she wanted to throw the first pitch at each ballpark in the major league.
So far she's done it 13 times, the latest Tuesday at the White Sox game against the Cleveland Indians in Chicago, WGN reported.
Not only did she get to throw the first pitch, she also was given a batting glove by Chicago third baseman Yolmer Sanchez and an autograph from Pitcher Lucas Giolito, WGN reported.
>> Need something to lift your spirits? Read more uplifting news
The next game she’s appearing at is the St. Louis Cardinals for pitch number 14 Wednesday night.
To follow Hailey's quest, click here.