A woman who slaughtered a pet goat at a Brisbane church in a Friday the 13th prank will be forced to apologise to the animal's owners and the church community.

Tracey Lee Arnold, 26, of Coorparoo, was today sentenced to two years' probation for the slaughter of Maddie the pet goat at Bellbowrie Community Church, west of Brisbane, on October 13 last year.

She pleaded guilty in Brisbane Magistrates Court last month to three counts including stealing and injuring an animal, but the sentencing was adjourned until today to allow for a psychiatric report to be prepared.