Living in Australia, this is quite obviously plastered all over the front page of our newspapers. However the sentiment of most people is, whilst accepting it is a tragic event, that there it was nothing more than a harmless prank with absolutely no intention of causing harm to any individual.
Pranks like these have been happening for a very long time and my personal opinion is she obviously made a mistake but I cannot believe how everyone has been sensationalising this episode. Even Prince Charles made a few light hearted comments about the prank and it simply wasn't that big a deal. I believe that behind the scenes she may have been absolutely berated or held accountable by the hospital which perhaps pushed her over the edge.
In terms of the legal side of things, there isn't anything that they can be held accountable for as has been ascertained already by lawyers.