What led to Amanda Bynes's surprising DUI arrest in 2012, and her recent bizarre behavior?
"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.
Another source, who calls Bynes "a very sweet girl," says, "[She] was raised in the industry and came up in the industry, so she has kind of a twisted head space in terms of social groups."
Her dad, however, says, "She just chooses not to work, and because of that people go after her."
In July 2010, Bynes reversed her Tweeted decision to retire from the entertainment business, telling PEOPLE a year later that she "just really needed some time off," adding, "I've been acting since I was 7."