Justin Bieber and Mariah Yeater
Kevin Winter/NBCUniversal/Getty; Pacific Coast News
With her paternity lawsuit against Justin Bieber dropped
, Mariah Yeater now is trying to pursue her claim
out of court.
"We're negotiating with Bieber's counsel, to reach a confidentiality agreement and to get private testing and results," one of Yeater's new lawyers, Chicago-based attorney Jeffrey M. Leving, tells PEOPLE.
Yeater's previous lawyers filed a request to dismiss the paternity suit in a San Diego court on Nov. 9, says Leving, who had been involved in the case earlier on and is now back, along with Los Angeles attorney John Carlson.
The attorneys for Yeater, 20, are negotiating with Bieber's camp for him to privately take a DNA test in the next few weeks to determine whether he's the father of Yeater's child.
"Yes, of course I believe my client's allegations," says Leving. "I can't comment on whether she has physical evidence or not."
Leving adds that he fears for his client's safety.
"I just spoke to Mariah today, someone was recently stalking her," he says. "She is happy that she changed her number so she's not getting death threats by phone. She's a young 20-year-old mother who now has to worry about her safety and her child's. It's a lot for any woman that age to handle."
Bieber's spokesman Matthew Hiltzik has not commented specifically on the withdrawal of the case, but says, "As we've said from the beginning, it's sad that someone would fabricate such a malicious, defamatory, and demonstrably false claim. We'll continue to consider all of our options to protect Justin."