Since she was found fully clothed and is said to have resisted sexual advances, it tells me there might have been evidence from the killer on her clothing. That could well be the incriminating evidence they have, if it is true IMO. Remembering too we heard on Wed the skin found under her nail was Joran's. I don't know where that came from {maybe unconfirmed}.
I think the skin under her finger nails came from her family to news reporters. I have no reason to believe thats a lie unless it's just sensational news reporting. We have yet to see Joran's pictures in short sleeves since his arrest, no?!? His face and neck don't bare wounds in photos since his arrest. IMO.