Amanda Bynes' doctors have reportedly recommended "prolonged treatment" for the star.
According to Radar Online, although the 27-year-old actress – who is currently under an extended involuntary psychiatric hold after setting a fire in a stranger's driveway – is showing signs of improvement, her medical team want to keep her at a psychiatric unit at UCLA until 2014.
A source told the gossip website: "[Doctors 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."
Bynes' mother Lynn has been granted a temporary conservatorship over her affairs, but the insider believes that the conservatorship needs to be come "permanent" to make sure that Bynes continues with her treatment.
The insider added: "Lynn needs to be granted permanent conservatorship because Amanda wouldn't agree to continue with treatment."
Regardless of Lynn's wishes, a source recently explained that all decisions regarding Bynes' treatment would "still need to go through Amanda's lawyer and the judge".