Annie Hillen, 84, also tried to smother James Hillen, 81, with a pillow at their flat in Glasgow's Thornwood on August 4, 2022.
James was struck on the shoulder but managed to disarm his wife before she came at him again with another blade.
Hillen later told police she was “disappointed” she had not killed him.
The pensioner had been due to stand trial accused of attempted murder.
But instead Hillen pleaded guilty to the reduced charge of assaulting her husband to his injury and danger of life.
Judge Tom Hughes said at the High Court in Paisley: “I make it abundantly clear to you that you face an extremely serious charge.
“It is a charge which involved an attack on your husband.
“From the information available to me, this was something you thought about and planned then proceeded to carry out in an attempt to injure your husband.
“It is very fortunate he did not sustain far more serious injuries - notwithstanding that what happened was serious”.
The judge said Hillen had made progress in dealing with her alcohol and mental health issues.
He further stated she had not caused difficulties at the supported accommodation where she now lives.
Judge Hughes then said a robust non-custodial option is the option “the court must take”.
Hillen was put under supervision for three years and tagged for one year, keeping her indoors between 7pm and 7am.
Hours before the attack, prosecutor Isabella Ennis KC said the pair had a “disagreement”.
James eventually went to bed in the room he separately u...