Kim Richards may have been eligible for a plea deal following her drunken arrest last month, but now, the issue is uncertain.

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After being arrested for public intoxication, resisting an officer and battery on an officer, the Real Housewives of Beverly Hills star entered treatment, but after leaving to attend her daughter's wedding in Mexico, has failed to return. Now, a source claims her alleged plea deal may be taken off the table.

"Kim would have had to successfully complete rehab, and the charges would have been dismissed,” an insider told Radar Online on Thursday. “The Beverly Hills Hotel didn’t want to proceed with charges if Kim was getting help. With Kim relapsing, the deal is now on hold, and the D.A. will most likely want a much longer rehab stint in exchange for the charges being dropped.”

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Richards was arrested on April 16 at the Beverly Hills Hotel after drinking heavily and disturbing other patrons. While staff asked Richards to leave the area, she refused and police were called. Once taken into custody, Richards reportedly became violent, kicking a police officer, which led to the battery charge.

Once she left treatment, Richards reportedly relapsed again -- within days -- and at this point, appears to be missing.

“Friends have been frantically calling Kim since hearing she had fallen off the wagon. Everyone is very concerned about her. It seems like no one knows where she is,” an insider said.

Richards will appear in court on June 11.