Another set of possibilities for her motive arises out of her relationship with the boyfriend.
Many here speculate that the boyfriend is probably her pimp/manager, but perhaps that is not the case, and it may even be that she had been lying to the boyfriend about her "secret life" (as her cousin claims she has been leading) as an escort and stripper. However, I still tend toward the theory that it was likely her boyfriend who dropped her off at the lacrosse party, and that they had had sex just prior to the lacrosse party.
One of the most frustrating things about this case is that I suspect the media is sitting on information about the boyfriend. Does the boyfriend have a connection to the police? Is that why the police detectives have skewed their investigation? I have a feeling once we find out more about the identity of the boyfriend some of the more mysterious aspects of this case will become clearer.
According a blog on another site, he has a rap sheet a mile long. I think the more we find out about him, the worse it will look for Crystal Magnum.