In the 2015 image, Foster lies next to her daughter in bed while Bella receives fluids through an IV.
“Watching my brave babies stuffer in silence in order to support me in my journey has struck the deepest core of hopelessness inside of me, it is because of them that I continue to fight relentlessly,” Foster wrote, echoing her speech from last year’s Global Lyme Alliance gala. “I will not allow them to live a life of pain and suffering.”
Gigi Hadid Shuts Down Body-Shamers
“I will prevail and walk to the end of the earth to find a cure for them and millions of others debilitated by this invisible disease!!!!” she continued. “We all deserve to live a healthy life, don’t you think?”
The 52-year-old added hashtags like “#WeMustFindACureAffordableForAll” and “#RealLifeProblems.”
Meanwhile, Bella’s father and Foster’s ex-husband Mohamed Hadid issued a response to Lisa Vanderpump‘s assertion that he doesn’t believe his children have Lyme on Watch What Happens Live on Tuesday.
The real estate developer also reposted the statement, which was read on-air by Andy Cohen, to Instagram.
“I do not wish to make public my family’s private matters, but I would like to make it clear that I completely and unequivocally support my children and their mother,” the statement read. “I have too much respect for all five of my children to speak about them publicly.”
Unfortunately, “it’s not uncommon” for family members to all have the disease, Dr. Raphael Kellman previously told PEOPLE.
“It’s not genetic, it’s because they share the same environment,” he explained.
In her Bravo blog Tuesday, Foster said she believes they all contracted the illness while living on their Santa Barbara horse ranch, where they “spent the majority of our time outside in nature,” for 10 years.
RHOBH airs Tuesday at 9 p.m. ET on Bravo.