EXCLUSIVE: Erika Jayne Promises Yolanda Foster Will Be 'Ready' to Confront 'Real Housewives' Co-Stars at Reuni

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After a season of speculation about her Lyme Disease, Real Housewives of Beverly Hills star Yolanda Hadid Foster is ready to fight back.

“I know for Yolanda to watch it back week by week is very painful, and we've discussed it,” Yolanda’s co-star, Erika Jayne, tells ETonline. “I feel for her, and I'm not quite sure where this is all coming from.”

“She's getting better day by day,” Erika adds. “She definitely has her good days and her bad days. But you know, she'll be there for the reunion. I know she's ready.”

WATCH: Kyle Richards Says RHOBH Co-Stars Are Questioning 'Exactly How Sick' Yolanda Foster Is

That’s good news for fans of the franchise, who will remember Yolanda left the season five reunion early -- her Lyme Disease made it hard to sit through the all-day taping.

The reunion is still a ways away -- first, Erika says fans should watch out for the episode they filmed in New York, at the Global Lyme Alliance Gala.

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

“You get to see other people telling the same story, and it’s not just this lone voice in the woods,” Erika teases. “It’s other people that are saying, ‘I’m suffering, these are my symptoms, I was told I was crazy.’ They all said that. You know, there was some real tears shed, because it was very emotional.”

ET was at the event -- check out the video below to see Yolanda’s emotional speech.