Robert Dobinson, 33, from Faringdon, was found at a mooring area near Bridge Street in Abingdon in October.
He was taken to hospital but died from his injuries.
Natasha Elderfield, 41, of no fixed address, was remanded in custody after a plea hearing at Oxford Crown Court. She will stand trial at the same court on 7 April.
A woman has denied murdering a man who was stabbed to death in an Oxfordshire town.