This whole thing is just hinky to me.
Why would "someone" pay CC $500 to drive him/her to the scene to commit a robbery? How did that someone know that KH would have anything of value on her? That just doesn't make sense! Even if she had a valuable ring/jewelry, after he paid the $500 to CC and then pawned the valuables, how much would we be talking about here? IMO, robbery was not the motive. I'm not even sure I believe that CC was being paid for her role in this.
IMO, either CC acted alone (her working as a dental assistant before is too much of a coincidence for me) and there's an unknown motive. OR, if someone else DID in fact pay her $500 to drive, they wanted something from KH that was priceless to them and they weren't after valuables or money. I don't buy the robbery motive nor do I think that this wasn't personal. Either CC had an accomplice or she didn't....either way, the $500 with the robbery motive doesn't jive for me.
I would not be surprised to hear that CC acted alone and this was her doing all along. Whether she took someone along for the ride or not, I don't believe her. This was personal for whatever reason. I think the $500 is just a flat out lie.