Lori Loughlin's daughters break silence on her birthday

(CNN) — Lori Loughlin's daughter Bella Giannulli broke her social media silence to wish her mother a happy birthday.

Loughlin turned 55 on July 28 and has been keeping a low profile ever since she and her fashion designer husband Mossimo Giannulli were among dozens of wealthy parents facing federal charges in a college admissions cheating scheme.

Prosecutors allege that the couple paid US$500,000 [approx. $724,525] to a fake charity to get their two daughters, Isabella, 20 and Olivia Jade, 19, into the University of Southern California by falsely designating them as crew team recruits.

Loughlin and Giannulli have pleaded not guilty to charges of conspiracy to commit fraud and conspiracy to commit money laundering. Each charge is punishable by up to 20 years in prison.

On July 28 their daughter Isabella posted a black and white photo with her mother on her official Instagram account.

"Happy birthday mama," the caption read. "I love you."

Her sister Olivia Jade, a social media influencer who along with her mother lost partnerships with some major companies when the scandal broke, wrote in the comments on the picture "My people" with a heart emoji.

Loughlin was written out of the Hallmark Channel series When Calls the Heart, but that didn't stop some of her former co-stars from remembering her on her special day.

Erin Krakow also posted a black and white photo of her and Loughlin.

"Happy Birthday to my forever friend with a heart of gold," Krakow wrote. "Love you!"

Paul Greene put up a pic featuring Loughlin and director Ron Oliver.

"Happiest Birthday Lori," the caption read. " @ronoliver was photo bombing on his 39th birthday."

By Lisa Respers France, CNN