Yolanda Foster Reveals How Bella Hadid's Battle With Lyme Disease Shattered Her Olympic Dreams

Plus, the reality star opens up about why her marriage to David Foster failed.

Yolanda Foster says she began noticing her daughter Bella Hadid’s Lyme disease symptoms when she started to mention having “severe pain in her spine.”

“Every night, she would [say], 'Mommy, massage my back please,' and I would make hot baths, and salt baths and try to massage her but from there, it went into her brain," the Real Housewives of Beverly Hills star revealed during an appearance on Tuesday's The Dr. Oz Show.

WATCH: Yolanda Foster Shares Pic of Daughter Bella Hadid's Lyme Disease Treatment

Yolanda added that the excruciating pain her 19-year-old daughter began to experience halted her Olympic dreams.

“Bella wanted to be a professional horseback rider, and her dream was to go to the Olympics,” Yolanda shared. “She’s been on a horse every day of her life since she was two years old. And all of a sudden she jumped 4-foot-5 courses and you need to have a very sharp brain in order to do the calculations. And she started making mistakes.

“All of a sudden instead of a six stride, she was trying to do it in a four stride or a seven stride and big accidents started happening,” she added.

As Yolanda has previously revealed, both Bella and her brother, Anwar Hadid, were both diagnosed with chronic Lyme disease in early 2012.

Watch: Yolanda Foster Says Lyme Disease 'Changed the Dynamic' of Her Marriage to David Foster

While talking with Dr. Oz, Yolanda also opened up her split from 66-year-old GRAMMY award-winning musician David Foster, whom she married in 2011.

In documents, Yolanda cites “irreconcilable differences” as the reason for the divorce, but she explained to Dr. Oz that her own battle with Lyme disease affected the marriage.

“The patient suffers but the caretakers suffer too because life doesn’t only change for us,” she said. “It changes for the person that’s next to you. And you know, at the end of the day, David never changed; I changed.”

“Unfortunately, these are the cards that life dealt me. It wasn’t by choice. But I’m not the woman I used to be and I probably will never be again,” Yolanda continued. “My focus, my energy goes to trying to get well, trying to make a difference, trying to find a cure for my children… and David’s life is really -- traveling, going to concerts, loud music. And I mean, I couldn’t, I can barely listen to the radio. Life changes.”

Despite their differences, David has stood by his ex, even when claims that she was exaggerating her disease surfaced.

"Over the past few weeks, a great deal of inaccurate or baseless information has been reported claiming to represent my thoughts and feelings," David said in a statement to ET. "It is painful to watch this happen repeatedly -- especially while trying to cope with the personal nature of the challenges surrounding the breakup of our loving marriage."

Watch below: