Aimi Wegrzyn lashed out at the man following a late-night drinking session at their home in Grieve Avenue, Jedburgh last month.
He suffered two cuts to his head and scratches to his face during the assault on September 10.
Jedburgh Sheriff Court heard the couple are on "good terms again", and that the incident was something Wegrzyn would regret as long as she lives.
Sheriff Peter Paterson accepted it was a "one-off" and deferred sentence on her for nine months for good behaviour.