And now, Melissa has taken to her blog to open up about the "intense" time for her family.
"My mother was admitted into the hospital and underwent an intense 8 hour surgery on a brain tumor," the actress wrote. "All of my 6 siblings and I gathered at my house and the hospital for the entire week to be strong for each other."
But Melissa said everything in the operating room went smoothly and her mom is now "on her way to recovery."
"Luckily, she is a good healer and has 7 children to lend a hand in times like these," Melissa added.
In helping to get through the tough times, the former "Sabrina the Teenage Witch" star said she and her family are not only relying on each other – but also on their faith.
"Prayer is a big part of my life and it was very crucial last week for my mommy," Melissa continued. "I ask that you keep her in your thoughts and prayers as she fights her way to a full and wonderful recovery. I love you Mommy!!!"