The troubled singer is recovering at a private clinic on London's Harley Street after suffering a fall at the weekend.
Her father Mitch was performing at the Cahill Gallery in London's Cork Street at event in honour of human rights lawyer Julian Young.
He sang five songs from his forthcoming album Rush Of Love, which is due to be released in June.
Then his daughter joined him on-stage to duet on September In The Rain and Fly Me To The Moon.
Amy, who was accompanied by friend Tyler James, then went for a drink in Camden where she lives.
Winehouse also gave a street musician a kiss while she was out and about in north London after he picked her up – causing her to wince
from her injuries.
A spokesman said: "She is obviously used to singing with Mitch, who introduced her to classic jazz and swing records when she was a child, and her bruised ribs clearly haven't affected her voice."