Somehow that Deadline article misses Hussey's most key role as the lead in classic slasher film, 1974's Black Christmas, which tackles some quite adult issues surrounding abortion between the Hussey and Keir Dullea characters during its course. Speaking of adult issues, she is amazing as the underage component of the adultery film All The Right Noises in which all three members of the love triangle have their issues explored in a surprisingly mature fashion. I wrote it up in more detal here, but Hussey has perhaps the most interesting role of having to move from a (literally) childish infatuation towards becoming aware that it was just a fling for the guy and it might be selfish to destroy a family because of what happened, no matter how significant their encounters were for her.
She is also in 1982's Australian version of The Most Dangerous Game (and proto-Running Man/Battle Royale/Hunger Games) film Turkey Shoot, aka the UK government baiting with its alternate VHS title Blood Camp Thatcher! And she's amongst the ensemble cast of Kinji Fukasaku's 1980 take on the disaster film Virus!