LOS ANGELES (Reuters) - Actress Lindsay Lohan has switched her court-ordered community service program after missing sessions at a Los Angeles women's shelter, officials said on Friday, raising questions about her responsibility.

Lohan, 25, was sentenced to 360 hours community service earlier this year as part of her sentence for stealing a gold necklace from a jewelry store. The "Mean Girls" actress also served 35 days under house arrest.

The judge in the case warned Lohan to take the requirements seriously and complete her community service on time. If not, she might violate probation and be sent back to jail.

Lohan has until May 2012 to complete the program and is due to return to court on October 19 for a progress meeting.

Los Angeles District Attorney's spokeswoman Jane Robison said Lohan was now working with the Red Cross after missing several visits at the women's shelter.

Celebrity website TMZ.com said Lohan repeatedly failed to show up at the women's center and when she did, she stayed less than the required four-hour session.

The actress' publicist confirmed that Lohan was now doing community service at the Red Cross, but declined to comment further.

The actress' once promising movie career has been derailed by multiple trips to jail and rehab since 2007.

(Reporting by Jill Serjeant; Editing by Bob Tourtellotte)