NONE......great point! I would also note she mentioned visiting the spot where her friend was attacked and she also talks of how she couldn't have done this to her own dog. Seems like at a minimum she knows something.
Yes it does. Notice the "I" regarding her fishing trip and not noticing anything......no "we"
"I can't believe I didn't see anything when I passed by here. I wish I had. I would have helped her. I would have fought for her if I had to."
http://www.clarionledger.com/story/news/2014/12/09/jessica-chambers-friend-fought/20160329/