Investigators said Ruth Wagner, 55, of Southington, allegedly stole several items from the city's Christmas Craft Fair and began fleeing when she was approached by a vendor who saw her take a seashell ornament, WVIT-TV, New Britain/Hartford/New Haven, Conn., reported Tuesday.
The vendor called out for someone to stop the woman and Wagner allegedly stabbed a woman who tried to block her exit in the arm with the seashell ornament.
The injured woman was taken to a local hospital to have a piece of the shell removed from her arm.
Witnesses took down Wagner's license plate number and she was arrested at her home, police said.
Wagner was charged with robbery in the first degree, assault in the second degree, reckless endangerment in the first degree, larceny in the sixth degree and breach of peace in the second degree. She was released on $100,000 bond.