A woman with ties to a right-wing activist group falsely claimed to The Washington Post that she had conceived a child with Roy S. Moore, the Republican Senate candidate in Alabama, when she was 15, the newspaper reported on Monday afternoon.

The woman, identified by the paper as Jaime T. Phillips, claimed in recent interviews with reporters that she had an abortion after having sex with Mr. Moore in 1992. But The Post said that it had discovered inconsistencies in her account and evidence that the woman concocted the sensational claim to try to dupe reporters and coax them into discussing the political impact her story could have on Mr. Moore.

A reporter with The Post confronted the woman about the holes in her story on Wednesday and then Post journalists saw her on Monday morning entering the offices of Project Veritas, a conservative group that films undercover videos. The organization, led by the activist James O’Keefe, has recently targeted journalists, trying to goad them into revealing biases or unethical schemes to discredit the news media.