When did LE say he might have an Eye injury?I agree. Unplanned in many ways seems the most likely.
But did she end up meeting up with someone she knows and things went bad quick? Or was she spotted by a prawler?
Where they planning to do it? Just not that day?
Could someone who knew her have driven by and pulled over to talk? Could they have gone into the woods to get off the road? Maybe some fight escalated?
What if she tried to leave and he tried to stop her? And something happens they are fighting she gets pushed down and is fighting back...maybe he gets a bloody nose and bleeds on her clothes (which is why he removed them), she scratches at an eye perhaps knocking out a contact (perhaps that's how LE knew he might have an eye injury)....he's trying to silence her and perhaps he strangled her, or breaks her neck, or bangs her head....or perhaps she bangs her head or breaks her neck just trying to get away....and now he has a dead girl on his hands....and panicks.....maybe he's married and he can't explain to his wife why he was there in the first place...all he has are some tools in his car...so he does what he can to cover it up.