That's terrible to hear. I can't imagine how devastated her family is, and how someone could deal with that guilt. I'm too familiar with someone who made a bad decision and spend the rest of their life paying for it. The guilt consumed them. You would think it would have been a wake up call, but it was the exact opposite. Unfortunately, they are no longer with us.
What frustrates me is the mindset that people think they're only risking themselves, so who cares. I've often heard, "I'd never drink if my kids are with me." What about the kids across the yellow lines in the other car? Also as aggregating, "I've done it a million times... I'll be fine."
I've made choices I shouldn't have. I've also been very lucky. I've seen first hand how bad it could have been for me had I not been as lucky. We all have to accept that we should never drink and drive. It's just not worth the risk.