Don't mess with mama! Amanda Bynes' mother, Lynn Bynes, is setting the record straight on rumors that her daughter's troubles over the past few years were due to mental illness.

"Amanda has no mental illness whatsoever. She has never been diagnosed as schizophrenic or bipolar," Bynes tells Us Weekly in a statement, via attorney Tamar Arminak. "She is very sorry for all the hurtful tweets, statements and actions that occurred while she was under the influence of marijuana." (Back in May 2013, Bynes was arrested for throwing a bong out a window from her NYC apartment.)

Bynes, 28, returned home back in December 2013 after several months of what was widely reported as treatment for mental illness. She sought treatment at a Malibu facility, and spent some time in the psych ward at UCLA Medical Center.

"Amanda currently is on zero medication. She's devoted to living her life as healthy as possible," Arminak adds to Us. "Her family is closely involved with her day-to-day life, but they try to give her as much autonomy as possible."

The former Nickelodeon star has seemingly been getting back to her old self since reuniting with Lynn and dad Rick. She's deleted all of her previous offending tweets, and is now majoring in fashion design at the Fashion Institute of Design & Merchandising in Orange County, Calif. Earlier this month, she celebrated her 28th birthday with a Cabo San Lucas, Mexico getaway with her parents.

"Thank you everyone for all the birthday wishes," she captioned via Twitter on April 5, as she shared a snapshot of her svelte figure in a neon yellow bikini.