Lisa's motherJean died at the age of 84 on Monday, June 17.
It's back-to-back tragic losses for the mother-of-two. Her brother Mark died in April of last year after he committed suicide.
According to reports, the reality star has officially stopped filming Vanderpump Rules after receiving the news.
Denise, 48, was grouped into a fan's complaint on Twitter that included her RHOBH costars Lisa Rinna, Dorit Kemsley, Erika Jayne and Teddi Mellencamp.
The fan asked them why they haven't issued public condolences for the Sur owner on social media.
"I personally like to send condolences privately when it is someone I know," Denise responded.
Do you agree with Denise? Sound off in the comments.