The actress, who had reason to believe the woman had a gun, persuaded the fan to reveal her address.
From her home in Los Angeles, Doherty then contacted the Westampton Township Police Department, in Burlington County, which immediately sent officers to the unnamed woman's home.
There police met with family members, TMZ said, who directed them to a 27-year-old woman in her bedroom. She told the responders she did not wish to do herself harm, and police found nothing that suggested she was an immediate danger to herself. The woman declined medical attention and police left her in the care of her family, the site said.
Doherty on Sunday tweeted, "Thank you to the Westampton Police Department for being diligent and so reassuring."
The actress, 41, most recently appeared in the Syfy TV-movie "Witchslayer Gretl" in February, and in this spring's WEtv reality show "Shannen Says," chronicling her October 2011 marriage to photographer Kurt Iswarienko. In August, Doherty directed the music video "Naked in Venice," featuring her "Charmed" co-star Holly Marie Combs, for the band Radical Something.