Amanda Bynes' doctors have reportedly recommended "prolonged treatment".
The 27-year-old star - who is currently under involuntary psychiatric hold - is showing signs of improvement but it is said medical professionals are keen to keep her in a unit at UCLA until 2014.
A source told RadarOnline.com: "[Doctor's have] been observing Amanda, and there has been some improvement ... However, her diagnosis is complex, and the appropriate drug cocktail to treat her hasn't been achieved yet.
"Therefore, her treatment team believes Amanda would benefit from prolonged treatment at UCLA, for at least the rest of the year.
"She has her good days and bad days, and the goal is obviously to get her therapeutic and stable before being released."