You can read the judgment here.
http://www.familycourt.gov.au/wps/wcm/resources/file/eb204741ce4e7c0/2010_FamCA_98.pdf
And here are some news articles.
http://www.brisbanetimes.com.au/queensland/parents-win-bid-to-sterilise-daughter-20100309-ptlf.html
http://mikiverse.blogspot.com/2010/03/disabled-girl-can-be-sterilised-court.html
And you think that this is a bad thing?