Lisa Vanderpump and her co-stars have been baffled by the ups and downs of Yolanda Foster's Lyme disease throughout the sixth season of The Real Housewives of Beverly Hills, and on Tuesday, the controversy surrounding her illness imploded at a party thrown by Erika Girardi.

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While no member of the cast has come out and said that Foster doesn't have the disease, their have been city-wide doubts spoken of, and in her latest blog, Vanderpump spoke of the speculation.

"The fighting spirit is never a bad thing. It assured me she is getting stronger, and if I had been immersed in a debilitating state for months and people were doubting me, I would be pissed," Vanderpump wrote in her Bravo blog after Tuesday night's episode. "However, there were inconsistencies that were confusing. I absolutely recall her running a marathon that she initiated, barely being able to catch her, I remember her driving home, so the disease obviously ebbs and flows, which is the baffling part. Now I stress I am not doubting, but it's mystifying as we witness it, to say the least."

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During the show, Foster slammed Lisa Rinna for repeating a shocking claim about Munchausen Syndrome, but according to Vanderpump, Rinna didn't do so viscously.

"I feebly tried to defend Rinna against the tirade from Yolanda. Rinna had regret undoubtedly. She was guilty of 'labeling' Yolanda, but in actuality, Rinna had repeated idle gossip that has been manifested from months of people witnessing sick selfies," Vanderpump explained.

For more Lisa Vanderpump, tune into The Real Housewives of Beverly Hills season six, airing on Tuesdays at 9 p.m. on Bravo.

Tags: lisa vanderpump Lisa Rinna Bravo Reality TV yolanda foster The Real Housewives of Beverly Hills