I've thought that as well. This past week I keep thinking of Jesse Matthews and pleading guilty to murdering both Morgan Harrigton and Hannah Graham. (probably others as well and we may never know.) No trial and he keeps all of his secrets.
So I went back to where I was a few years ago and found this article:
Jesse Matthew Pleads Guilty to Murders of Harrington and Graham
What stands out to me when I read this again with fresh eyes is this quote: "Graham's left nasal bone had piece of a bone that was broken away, and that she likely died by strangulation or suffocation. It appeared the UVA student fought back, as witnesses told investigators that
Matthew had a swollen jaw at work immediately after the time she was murdered."
Mollie's dad says she's a fighter. She would fight back. We may never know because his co-workers are scared and worried, but I wonder if anyone saw anything different with CR the next day. Scratches, swollen jaw, etc. A fight would show that.