Tompkins says Jackson promised her a house a decade ago, but had recently wanted to evict her and their 10-year-old son, Marquise, from the house in Dix Hills, New York.
The house in the Long Island neighborhood was destroyed by a suspicious fire on May 30.
Tompkins, Marquise and four others were treated for smoke inhalation.
The blaze occurred just days after a heated confrontation inside the woman's attorney's office over the home.
A passing off-duty police officer helped rescue the six people off an elevated deck in the home's backyard, Feld said.
Earlier this year, Tompkins filed suit against 50 Cent.
Tompkins' lawyer, Paul Catsandonis, told The Associated Press in a telephone interview that the dispute over the house had become "extremely, extremely contentious" in recent days. Although he declined to be specific, he said there was an "extremely dangerous incident" on Monday in his Manhattan office while taking a deposition for the lawsuit.
The dispute was "involving the parties in question," he said.
Catsandonis said the 32-year-old rapper paid about $2.4 million for the house, one of the largest in the neighborhood. He said 50 Cent, who was shot outside his grandmother's Queens home in 2000, had told Tompkins, 32, he wanted her and their son to live in a safe and secure place.
He also contended that the rapper signed an agreement that would give Tompkins half of all the rappers' earnings as a hip-hop superstar. "Everything that's his is hers, everything that's hers is his. He memorialized in an email that he intended to give her the house."
The rapper has been nominated for 13 Grammys, including nods for the song "In da Club" and the album "Get Rich or Die Tryin'." In 2005, he starred with Terrence Howard in a semi-autobiographical movie based on that album.
He also starred in the 2006 film "Home of the Brave" as a soldier returning home from the Iraq War.
