The reality star's sister Kathy Hilton posted an Instagram from the bash
Credit: Michael Larsen/Bravo/NBC/Getty

Kim Richards stepped out for her daughter Brooke Brinson’s bridal shower days after police filed charges stemming from her April arrest.

The Real Housewives of Beverly Hills star smiles in an Instagram her sister Kathy Hilton posted to Instagram Thursday. The photo shows the women flanking Brinson, who is set to marry Thayer Wiederhorn.

“Kim is so excited for her daughter’s wedding next weekend. She wouldn’t miss it,” a source close to Richards tells PEOPLE. “As of recently, the plan was for her to go back to rehab afterwards.”

Richards, 50, was charged with three misdemeanors – public intoxication, resisting arrest and battery on an officer – on Monday. It all started April 16, when she was arrested at the Beverly Hills Hotel after drinking and driving.

“The family isn’t surprised about the charges,” the source tells PEOPLE. “They were expecting them. Everyone just wants Kim to be healthy.”

Throughout the past season of RHOBH, the former child actress insisted she was sober despite her erratic behavior on screen. She fought with costars, including sister Kyle Richards, over the accusations. (The source says Kim and Kyle are still not speaking.)

In a Dr. Phil intervention that aired April 28, Richards admitted she needed help but declined the talk show host’s offer to pay for her treatment at a Malibu center. PEOPLE has learned that she checked herself into rehab after the taping.

With reporting by AILI NAHAS