Her rep confirms:

"Unfortunately Denise's mother has passed away after a long battle with cancer,"

Last year Denise opened up about her personal struggles, saying:

"I was always a people pleaser and I just finally got to the point in my life after having my daughters and going through a really ugly divorce, and recently, my mother is sick with cancer … I've just gotten to the point where life is so short and I just want to be happy."