"We're doing a big, old-fashioned séance," medium Tim Braun told Gunvalson, her brother Billy and boyfriend Brooks, as well Tamra Judge and Shannon Beador.
"If it gives me a sense of peace, what's it going to hurt?" asked Gunvalson. "My brother Billy is not doing well … [he and my mom] lived five minutes apart."
The medium asked everyone to concentrate on the "spirit's white light" and told Gunvalson and her brother their mother experienced "no pain" when she passed.
"There was nothing you could do to stop this," he told them via their mother, saying she wanted them to know that "my dental work is all done … my teeth are all perfect," which elicited shock from Gunvalson who said she had been paying for her mom's work.
But not everyone was buying it.
"Guy had nothin'," said Judge, who interrupted the medium to ask a question and was promptly shut down, telling her she was "interfering."
"Somebody's full of s--- here, and I'm not sure it's Billy," Judge remarked, after the medium told Gunvalson's brother his bowels were blocked.
In order to help Gunvalson get her mind off her mom, the wives took her out for a night of bowling.
"I wish Gucci would make bowling shoes," said Gunvalson as most of the wives wanted to wear heels to bowl. "Whoever's making them now is doing a very bad job."
But despite winning the bowling game against the other wives, Gunvalson's humor was short-lived.
"My mom will babysit them," Gunvalson said to Judge at the alley when she mentioned offhand that she needed to spend some time with her daughter, Briana, and that her mother could watch her children.
"I forgot my mom died," a stunned Gunvalson then said as the wives rushed to her side. "I've been leaving her phone messages. To me, she's still alive … my heart is hurting."
But she felt the love at dinner.
"I've had a rough time the last few weeks," she told the wives. "Going out, having some fun and drinks, going bowling … that's what friends are for."
Real Housewives of Orange County Star Shannon Beador on Her Husband's Affair: I Can Go Days Without Thinking About It
The Real Housewives of Orange County airs Mondays (9 p.m. ET) on Bravo.