Yolanda Hadid's daughter Bella "motivates" her to find a cure for Lyme disease.

Yolanda Hadid

Yolanda Hadid

The 'Real Housewives Of Beverly Hills' star - who suffers from the disease along with two of her children, Bella, 20, and Anwar, 17 - desperately wants to help discover a way of permanently treating the illness after seeing her daughter "suffer every day" and have to give up her dreams of becoming an equestrian.

Speaking to reporters in Sydney, she said: "It's something she worked for her whole life but she got too sick and her brain was too effected to continue that journey. She re-tracked, we treated her, and she moved in another direction.

"Thank God it worked out the way it did. But Bella is still suffering every day. That's what motivates me. We must finds a cure. Nobody deserves to live a debilitating life."

Meanwhile, the 52-year-old television personality - who also has 21-year-old daughter Gigi Hadid with her first husband Mohamed Hadid - previously praised Bella for dealing with the "invisible disability that rules her life" so well.

She said: "It's hard for people to understand the invisible disability that rules our life, especially behind the beautiful face that shines so bright on the cover of magazines."

And the 20-year-old model has nothing but praise for her mother Yolanda and the struggle she has been through in the past five years.

She shared: "I am so proud of my mom. I have seen you in bed, struggling for the past five years of our lives, thinking to myself 'why would this happen to such an angel? I would cry to myself knowing that there was nothing I could do to help and that there were people going against you and what you are/were going through."