Just picking up from the conversation that was occuring last night (I was exhausted and went to bed early for a change) - we need to look into different scenarios. We can look at some of the usual ones - and let me say right up front that I'm not saying they have anything to do with Mickey although we don't know much about her.
In many high profile murder cases, especially over the last few years, motive has usually been Love/Lust. A majority involve affairs - married man with a girlfriend who either murders the wife to pursue a life with the girlfriend, or murder the girlfriend so the wife doesn't find out about the girlfriend. Sometimes the wife murders the girlfriend. Complications can also include a pregnant girlfriend.
Another scenario - gays/lesbians who are about to be outed. Can either be suicide or runaway. Or a hate crime.
Personal problems - a person can feel a lack of confidence in taking on the real world. There was a case of the runaway bride - none of that made sense to the majority of us, but I guess when you feel unable to handle life you walk away from it without looking at the repercussions.
Drugs - OD or deal gone wrong. Being in the wrong place at the wrong time.
Rape - resulting in a murder.
Jealousy - Killing someone because you feel like they are "in the way" of getting something you want. Remember the cheerleader's mom? It could be anything from a love interest or a job to a horse competition or popularity contest! It doesn't have to look like an important thing to us for it to be highly important to someone who is a bit "off".
Mistaken identity - she may possibly have been very similar to another person. From the back, many small blondes look like any other small blonde. Especially at night.
I'm sure there are many more.
As for Mickey, I just feel like she got into a vehicle with someone she thought she knew and was betrayed. The reason she was betrayed - ??? We don't know enough about her to know what that could be. I just wish she could be found.