Anna Nicole Smith arrived Friday at a federal courthouse in San Francisco to continue her legal battle over her late husband's fortunes.

At issue is the will of oil tycoon J. Howard Marshall III, which did not include Smith. She has argued he intended to provide for her through a special trust.

David Madden, a spokesman for the court, said Smith was at the building, which houses the 9th U.S. Circuit Court of Appeals, for a mediation hearing. Calls to lawyers weren't immediately returned.

Click here for the Anna Nicole Smith Celebrity Center

The case made its way all the way to the U.S. Supreme Court, which revived the former Playboy playmate's pursuit of her late husband's estate by ruling she deserved another day in court.

Smith initially won a $474 million judgment, which was cut to about $89 million and eventually reduced to zero before the Supreme Court stepped in.

Marshall died in 1995 at age 90, a year after they married. Smith was 26 when they wed.

The U.S. Supreme Court said in May that only federal courts in California could deal with her case despite a Texas state court ruling that Marshall's youngest son was sole heir to the estate.

Smith's arrival at the downtown courthouse, wearing a black dress and sunglasses, marked the first time she left the Bahamas since the death of her son, Daniel, and the birth of her daughter, Dannielynn Hope Marshall Stern, in September.

Click here for the Anna Nicole Smith Celebrity Center