Crash investigators do this for a living?

Our Daughter was in a serious accident last weekend and totaled her Dodge Avenger.
She was life flighted to the critical care unit in Phoenix and was on a ventilator for the first two days because they didn't think she was going to survive, but she is home now and doing ok considering she can hardly move and has multiple related injuries.
Her right side tires got off the edge of the freshly layed 3 inch thick black asphalt and it pulled her into the drainage ditch that the car couldn't climb back out of and at the next upcoming driveway she hit the end of a buried culvert and flipped the car literally tearing the front end off except for the motor and wheels.
This happened about 10pm Sunday night, and the new asphalt they layed just recently is on a sweeping corner with a 3 inch drop off edge (black) with no markings whatsoever, and on an unlit street.

Now here's the WTF? part of it.
The investigator said "she wasn't wearing her seat belt and was ejected from the passengers side window."

Well I got to the scene right after the crash because it was right down the street from our house.
I was looking at the car when they told me what they think happened.
I told the officer that she ALWAYS wears her seat belt, and that if she was ejected out the passengers side window, why was the window all the way up and not broken?

His response was that one of the other officers (or some random passer by) must have rolled it up after the accident. (obviously this is a stupid theory having zero witnesses or any info pointing to this)
Now I'm thinking this guy has NO clue about what he is doing and writing as a report.
I said that would be pretty hard to do considering the battery is just in front of the drivers side wheel and all that part of the car was ripped off.
That's when he started getting an attitude like I was interfering with his investigation.

Personally I would think the report should say "Due to a ridge on the edge of an unlit and completely unmarked or lined street the car tires dropped off the edge of the asphalt and pulled the car out of control into the drainage ditch where it could not be recovered and impacted a driveway culvert."
Obviously I realize why it won't say this, but everything points to this being the case.
Even the tire tracks off the edge and in the ditch indicate this.
Unfortunately our Daughter doesn't remember any of it, so there is no point in taking it any farther.

In the end it really doesn't matter what the sequence of events were, as the car is totaled and our Daughter was damn near dead, but what the hell this investigator was thinking and wrote in his report, and how he could come to his conclusion is ridiculous.


Do you live in Supprise?