Police said the woman was arrested yesterday. Police had earlier announced a reward of Rs 5,000 on information leading to her arrest.
A police officer said the woman was an accused in the murder of a man, Mujahid.
Mujahid was abducted and murdered in Khatoli town on May 27, 2015. His body was then tied to a motorcycle and thrown into a water body.
Two other accused in the case had already been arrested, the police officer said.
In a separate case, the Uttar Pradesh Special Task Force claimed to have arrested a notorious criminal from Matbhed village in the district last evening.
Police had announced a reward of Rs 12,000 on information leading to his arrest.