I don't think two hours is an uncommon time frame once a body has been located. That entire area becomes a crime scene and evidence needs to be secured, and medical examiner called to the area, etc. While there was already an investigation, it becomes a different investigation of the crime scene. At this point, we don't know if there is another crime scene, or if this place was the one.
There were some investigators there looking, but more showed up after she was found, and each of those people have a job to do, and to document. Photos from all angles, measurements, etc. are probably done. Even after the body is removed, there's still evidence they have to collect.
While the human part of us wants the body quickly removed, to the investigators, they probably realize their job has just begun, and removing the body too quickly would jeopardize the evidence. They realize they can't do anything to bring back life, but they can bring justice!
I've seen in some cases the police find the body near dark, and secure the area until the morning to remove the body.