I was thinking about all of this last night. BD showed up at the DPD willingly but possibly with a lawyer. LE did know BD had borrowed that Jeep from someone she knew and he had no idea what his vehicle was going to be used for. I do believe she answered some non incriminating questions and then her lawyer said that's it, we are out of here if she is not being arrested in the case. LE let her go even though their own common sense told them she was the instigator of the murder. Maybe at that time LE couldn't prove it, but knew it.
But why not arrest BD for conspiracy to commit robbery? Charges can be upgraded. I realize she would have most likely bonded out, but it would have bought LE a little time to further investigate. Why not keep in touch with her while investigating? I just do not understand LE's actions in this case. It was a high profile murder case, FGS!
I firmly believe BD was advised to 'visit' Mexico. A family member took BD to board a bus to Mexico. To me that would be aiding and abetting a fugitive!
MOO