The stepmother of a missing New Hampshire girl accused of lying that the child was living with her to collect food stamp benefits faces new, unrelated firearms charges, days after the girl’s father was arrested on similar charges. Kayla Montgomery, 31, is accused of receiving a rifle and a shotgun between Sept. 29 and Oct. 22 of 2019, knowing that they had been stolen or believing they had probably been stolen. She has been in jail since January on a felony theft charge. She allegedly told state Health Department workers that her stepdaughter, Harmony Montgomery, was a member of her household from November 2019 to June 2, 2021, and that she received food stamp benefits for Harmony. She’s pleaded not guilty to the theft charge. Authorities say Harmony Montgomery vanished sometime in late November or early December of 2019 — but authorities didn’t know she was missing until last fall. Harmony’s father, Adam Montgomery, who had custody of his daughter, also has been in jail since January on an assault charge, alleging he struck Harmony in the face in July 2019. He’s pleaded not guilty to that and to two misdemeanor charges of interference with custody and endangering the welfare of a child. He recently was arrested on eight unrelated firearms theft charges stemming from 2019.