ETA: Where is Shannon?!?!?!?!
Excellent question. Up to this point the RCMP have released minimal information to the public regarding Shannon's disappearance, so trying to piece together a series of events in her case is difficult at best.
Unfortunately she hasn't been seen or heard from in nearly three years.
Based on what little we know,
IMO there's no obvious motive for Shannon's disappearance. It was reported in the media that her former BF's residence was searched by the RCMP, but what was found during that search, if anything, has not been disclosed AFAIK. We know Shannon's Jeep was recovered shortly after her disappearance, but again, no information regarding possible evidence from her vehicle has been released.
If Shannon met with foul play,
IMO it seems odd that her vehicle would be found parked on a city street where it would be easily and quickly found.
MOO, but based on media reports and interviews with her friends, it seems highly unlikely that Shannon would voluntarily disappear.
There are still many unanswered questions in this case.