MOORE, Okla. – It’s a lovely fall day, and 4-year-old Katie Green from Moore is humming with happiness.

She’s happy to be back outside, playing with her posse of cousins.

“When she got sick and her cousins couldn’t be around her, she would cry for them and they would cry for her,” said her mother, Susan.

She said they knew something was wrong last June after a family trip.

Katie couldn’t shake a virus her cousins quickly recovered from.

“As soon as we went into the pediatrician, he noticed her spleen was large and she was too pale, so we ended up here at Jimmy Everest Center for Cancer the next day,” Susan said.

Katie has acute lymphoblastic leukemia or ALL.

The first few weeks of treatment were a blur of intensive chemotherapy.

At times, the medical attention overwhelms Katie.

While a nurse attempts to measure her vital signs, Katie starts to cry and begs to go home.

Moments later, her sunny side comes through.

As a nurse preps her intravenous port for chemotherapy, Katie bursts out laughing.

“She’s one of the most adorable patients I’ve had the pleasure of taking care of,” said pediatric oncologist Dr. Osman Khan.

He said it’s thrilling to see a very sick child become cancer free in just a few short weeks.

Doctors are constantly improving ways to tailor treatment to patients.

“This has been fantastic progress over the past 15 years or so. Our ability to better categorize patients, to better individualize treatments and to do personalized treatment for each patient,” Khan said.

Susan agrees.

“The staff is amazing. They all know her by name,” she said.

The Green family waits for the next stage of treatment, playing with toys in the clinic art room.

Katie instructs her parents to join in as she fills a small house with stuffed ponies.

“Can I come play?” asks her dad.

“Sure,” Katie chirps back in response.

These moments are ones the Greens treasure.

Katie’s arrival in the world was a big surprise, and they often referred to her as their miracle baby.

Their only other daughter was grown up and out of the house when Susan discovered she was expecting.

Now, with two years of maintenance chemotherapy still ahead for Katie, the Greens said their daughter is happy, growing and leading them into a bright future.

“She’s hitting every milestone. She seems to be doing great,” said Susan with a smile.

Katie really is their miracle girl.

You can help families like the Greens by supporting Jimmy Everest Center for Cancer.

‘Kids With Courage’ is sponsored by the Jimmy Everest Center.