Published: May 10, 2010 10:07 PM EDT

OCALA, Fla. - Attorneys for talk show host Nancy Grace say the mother of a missing toddler who appeared on her cable show in 2006 shortly before committing suicide had "talking points" for an interview and wasn't ambushed on the show.

Grace's attorneys say Melinda Duckett wasn't taken by surprise in an interview about her missing 2-year-old son in a motion they filed asking a judge to throw out the wrongful death lawsuit filed by Duckett's estate.

Grace, the host of a talk show on HLN, formerly CNN Headline News, is being sued by Duckett's family. They blame her for inflicting emotional distress on the 21-year-old mother during an appearance on her talk show in 2006.

The trial in federal court in Florida is set to start in August.