FWIW... I don't think she took a foolhardy chance. Running in the canyon is a very common activity. She just made a mistake by not taking enough water. She compounded that mistake by leaving the trail to try and shortcut to the river. You could say that that was taking a chance, but at that point she was in survival mode and just looking for help. My point is, starting out... she did not intentionally do anything that was that risky. She just made some mistakes.
You are a moron. If you don't call not taking enough water "not taking chances" then I'd sure never want to do that run with you as my backup. Just running in that heat is taking chances.