The accused have been identified as Natthi Singh and his son Ravi, they said.
Natthi Singh, his son were involved in an argument with the victim's husband Mukesh on a land dispute, police said, adding, Meera Devi came to the rescue of her husband when she was shot at by Singh.
She was rushed to a hospital where she succumbed to her injuries, they said.
Singh and his son Ravi have been arrested and sent them to jail, police said.