Anthony Monterotti/Pacific Coast News
07/30/2008 AT 07:45 PM EDT
's father will likely remain in control of the singer's affairs following a court review Thursday, an expert says.
"I would be very surprised if the court ends her father's control so soon," says Terry K. Wasserman, a mental health attorney not involved in her case. "It's rare for someone to regain their capacity in just 60 days."
Two months ago, Spears's attorney Samuel Ingham testified that the pop star was unfit to take part in legal proceedings. "In fact, they could be harmful to her," Ingham said.
Jamie Spears, 56, was named temporary conservator of her affairs on Feb. 1 following his 26-year-old daughter's two forced hospitalizations in January.
He has sole authority over whom she has contact with, and has hired security guards to watch her 24 hours a day. Her father also shares control with another lawyer over her multimillion-dollar estate.
Conservatorships can last anywhere from several months up to a person's lifetime.
"Britney can only regain control of her life if she proves to the court – backed by medical experts – that she's regained her health," Wasserman says.
Thursday's hearing will also determine whether a restraining order will be renewed against the singer's former pal Sam Lutfi.
Last week, Spears and ex-husband Kevin Federline
, 30, ended their custody battle
, reaching a settlement in which Federline retains sole custody of sons Preston, 2 1/2, and Jayden, 1 1/2, with visits by Spears.