The report says that the entry wound was in front of the left ear and the exit wound was above the right ear so how can the head be turned so that at least one of these wounds doesn't show?
The exit wound is usually bigger unless the muzzle of the gun was next to the head.
Victimology assessment has to be done, too random (though violence is never random), no sexual assault , no torture, no robbery, no apparent motive. No evidence of overkill or rage, (interpersonal violence), her body isn't hidden.
In this case, you need to delve into her personal life I feel that's where the answer lies . The WHY she was killed, will lead to the WHO
Most interesting would be anyone she has had problems with recently, anyone she was involved with , if there was ANY evidence of stalking behavior prior, or if anything has recently changed in her life.
It would also be pertinent to determine if she was the type of person who would get into a car with a stranger.
Trajectory is interesting as well in front of the left ear, exit wound is above the left ear. Indicates either the muzzle was on an angle, in front and slightly below or her head was on an angle (perhaps laying ) when she was shot.
Id be interested to know what the suspected range of the shot was through ballistics, primarily if there was evidence of a contact shot , or even close range, with burns and any stippling.
IF LE feels she got into a car with someone a firearm held in either the right or left hand of an occupant in the drivers side firing upon a person sitting in the passenger side of a vehicle could create such an angle .
The Muzzle would be below and slightly in front of the victim.
With no evidence other than an murder, we must ask what was the significance, of her death, WHAT purpose did her death serve?
-She wasn't sexually assaulted, with NO evidence of any sexual component to the murder
-There's no report of anything taken
-No evidence she fought with her killer
-She wasn't bound
-LE feels she got into a car with someone
-She was laid where LE feels she would be found even used the term "Gingerly"
-LE feels she was killed somewhere else, and dumped where she was found
-LE feels at one point either the notebook found covered her wound (I suspect it was used to cover her face)
The placement of her body, is interesting, as the article stated she was "gingerly" placed, even though she was obviously dead, her killer, didn't want to hurt her anymore, he (or she) wanted her to be found.
2 things really stand out , the statement that her head was turned so you couldn't see the wound (I'm assuming the exit wound because typically its larger and more graphic) and thaw Law enforcement felt the notebook, found next to her was used to cover her wound
If that's what indeed happened, that's indicative of what's called "undoing" a form of remorse for what the killer had done. He9She) didn't wasn't to see what they did to her, they didn't want her to rot away somewhere, without her family ever knowing what happened.
When you see this you start to look close. The person is often someone the victim knew.
Now , there's a thousand possibilities, that could come from that hence the importance, of the victimology assessment
Some possibilities:
-Jilted love
-Jealous rival (either directly or indirectly through a third party)
-Possible Stalker
-Retribution/revenge
-Personal involvement in something ( knew too much)
-Argument spinning out of control
-Even a simple accidental discharge of the weapon (carelessness) intentionally or unintentionally pointed in her direction! 
