In cases like this, you never know what the circumstances were about the crash. Was she not riding with lights or reflective clothing? Was she wearing a helmet? Was she riding on the shoulder, bike lane, road...? Was the driver of the Escalade texting, eating breakfast, doing her makeup, sleepy...? We may never know many of these answers.
The main question to ask after this tragedy is; what do we do to help prevent these senseless crashes? The more I see other examples of cycling cultures, and the way that people address cycling and safety, the more I have to think that controlling vehicular speeds, increasing the number of cyclists on the roadways through various methods (facilities, bike sharing, education, marketing, etc), and cracking down on driving with distractions and following proper cycling rules, are the best ways to help protect cyclists and create a balanced/livable transportation culture on the roadways.
Cyclist crashes are never going to stop happening, just like car crashes are never going to go away. Crashes like the tragedy above will hopefully draw attention to these issues and their deaths won't be in complete vain.