Taylor Armstrong is concerned about Yolanda Foster.

Is 'RHOBH' Yolanda Foster Faking Her Lyme Disease? Co-Star Speaks!

Although Tuesday night's Real Housewives of Beverly Hills seemed to hint that Armstrong believed Foster was faking her illness, she has since claimed that was not the case.

"When Yolanda was first diagnosed with Lyme disease, I shared my thoughts with her about the potential for a misdiagnosis," Armstrong explained to Bravo TV earlier this week. "I have had two family members with Multiple Sclerosis, and it took quite a long time for them to be properly diagnosed. The symptoms she described were similar to what my family members experienced. My husband's friend is a world-renowned diagnostic neurologist, and I offered to connect Yolanda with him for an appointment or even a phone call to describe her condition and get his thoughts. She declined to do so, but I was concerned for her and wanted to offer the option of another opinion."

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After attempting to help Foster unsuccessfully, Armstrong met with the women, as fans saw on Tuesday, and asked questions about why she sometimes seemed happy, but other times seemed sick. Still, she doesn't think Foster isn't really sick.

"I know that she is ill," Armstrong insisted. "I was not questioning that, and I wasn't questioning Yolanda. I was merely suggesting that since all the Lyme disease treatments were not helping her, maybe she and her doctors should consider other possibilities."

The Real Housewives of Beverly Hills season six airs Tuesdays at 9 p.m. on Bravo.