Yeah, I think you’re likely to be proven correct here. I think this was a spontaneous crime, precipitated by an act of rage (abuse). The dumping of her body, should reflect this. What worries me somewhat, is that so much time passed between the (likely) murder, and its discovery by law enforcement. My fear, is that her body may have been placed in a dumpster, which would make recovery difficult at best. Hopefully that isn’t the case, and she was put in a location where she can be found.