Brandi Glanville has returned to The Real Housewives of Beverly Hills as a guest star during season six.

Although the mother of two was demoted from her full-time role ahead of production on the currently airing season, she wasn't ready to quit the series all together, and a while after filming began, she rejoined her co-stars, including friends Kim Richards and Yolanda Foster. But why did she return to the series that she once compared to an "abusive boyfriend?"

"Money," she told PEOPLE Magazine at The Real Housewives of Beverly Hills premiere party earlier this week, via a report on Friday.

Brandi Glanville Claims 'RHOBH' Star Yolanda Foster Is 'Strong' After Divorce

Also during the premiere party, Glanville weighed in on the speculation regarding Yolanda Foster's Lyme disease diagnosis, which has often been talked about on the show.

"I'm livid, honestly," Glanville told Entertainment Tonight. "Outside of filming, they don't know her. When we're not filming, I hang out with Yo."

According to Glanville, she's watched Foster stuggle with the disease for the last three years, and knows and comments about her faking symptoms is ridiculous. In fact, Glanville claims to have had to help Foster get dressed because "she couldn't move."

"I have this passion in my gut, and she's like, 'Don't fight for me.' She doesn't want me to. She's like, 'Keep it classy,'" Glanville said. "It hurts me. It hurts my heart to see these women do this to her."

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

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Brandi Glanville, The Real Housewives of Beverly Hills, Bravo, Reality TV