While you make some interesting points, the validity largely rests on answers we do not have from Snodgrass (questions I asked in the "Devil is in the Details - Questions for Ryan" post)

Just to clarify the timeline (ranges given because times are not precise):

0 - Raft dumps swims
5-15 min - Girl self rescues, emergency personnel are called
30-45 min - emergency rescue and Ryan Snodgrass on opposite bank in verbal-visual contact with patient (who is first is still under debate)
45-60 min - Ryan swims across the river and walks to the patient
60-75 min - Emergency personnel cross the river and walk to the patient
75-90 min - Emergency personnel return patient to the roadside.

And to reiterate some points:

She couldn't be walked back to the bridge according to Ryan's original post.

SINCE RESOURCES FOR A DRY TRANSPORT WERE AVAILABLE:
If she was critically injured, putting her back in the water is not appropriate care as it would worsen hypothermia and exacerbate trauma.
If she was not-critically injured, putting her back in the water is not necessary because you have time and alternatives. Getting her wet would certainly more stress.