A two-year-old girl in Minnesota has a second chance at a healthy life after a stranger saw her story on Facebook.

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Arianna Moore’s kidney started to fail when she was just seven weeks old due to a rare genetic disorder that causes scarring of the kidney. The toddler undergoes 10 hours of dialysis every day. She is about 10 pounds lighter and four inches shorter than her twin sister.

Recently, a family member started a Facebook page to promote a benefit for Arianna – but they knew the chances of finding a donor through social media were slim.

That's where Christy Harding, a woman who lives more than 1,500 miles away in Jacksonville, Florida, comes in.

Harding told Fox 9 News, “I get really sad over sick children, so I usually skim those posts kind of quickly. This is the first time that I've stopped."

She began to wonder if she could be a match for the two-year-old girl. So Harding flew to the Twin Cities for a special blood test before contacting the family and offering to become a donor.

"I have a 2-year-old daughter, and that's probably one of the biggest reasons. When my husband and I were talking, we knew that if it were her, we would want everyone in the world to try and save her," Harding said.

Arianna's mom Ashley is thankful for the generosity of a stranger. "It's a big surgery, and [Harding’s] doing it for a baby. She's never met our family."

Arianna will receive her new kidney in a few weeks, but the story doesn’t end there. Harding is raising money to send the entire Moore family to Disney World for a vacation once Arianna is healthy.

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