My gut reaction to this is first, that her killer knew her, somehow - either directly (someone in her life) or indirectly (someone who Shandee didn't know personally but who was familiar with her). Because.. 22 stab wounds. No mention of rape. All so quickly.. And so close to her home, like they were just waiting for her to turn that corner. Was someone upset she was leaving the country with her boyfriend/that she had a boyfriend in the first place? Mad at her about some issue at work? That she left the Gold Coast? Was there a reason her family and best friend were so concerned for her safety there?
22 stab wounds is overkill, a terrible rage. And someone was walking around pre-armed with a weapon.
Ofc, I could be wrong and it might have been sheer crime-of-opportunity for a psychopath or raving meth addict wandering about with a knife, but yeah. Gut says the killer knew her. In one way or another.
Whatever the case, I hope they catch her killer quickly. Poor Shandee, her family must be devastated.