She had a lot of cuts, which are certainly explainable by impact with the trees and the house. The blood on her toes, feet and thigh could have been from the blood at her cervix and vaginal bleeding which is common in hangings. The blood on the three fingers could be the same from when her hands were behind her back on the ground after she was cut down. The bruising is more than likely before death as you don't bruise after death and I really don't recall reading a LOT of bruising. Bruises here & there, which IMO are normal for an athlete.
I don't think someone would strangle her before they hit her on her head and bound her head behind her back. I don't see a homicide here. The three main suspects are accounted for, and a hit IMO is improbable. MOO.