updated 04/09/2012 AT 2:00 PM ET
•originally published 04/10/2012 AT 4:00 PM ET
“This DUI was definitely just a serious lapse in judgment,” a source tells PEOPLE of the former Nickelodeon star.
“She hit a wall personally and professionally [in 2008] … I think she’s been a little lost since then,” the insider says of the actress, who dated Doug Reinhardt in 2009 and was linked to Liam Hemsworth shortly afterward.
But according to the 26-year-old’s father, Rick Bynes, his daughter doesn’t drink. He tells PEOPLE she was held in jail because “she was upset and very emotional.”