Someone I knew very well killed himself, and it was a total shock. He had shown no signs of being suicidal. The family members often have no warning. The fact that some 19 year old thinks she wasn't suicidal is totally irrelevant.
We had that happen here in my town a few months ago. A 20 year old girl got into a fight with her mom, Googled how to kill herself, and did it. I hate to sound like an old fuddy duddy, but kids these days have the mentality of "do first, think later". You can say "she would NEVER EVER" all you want, but the truth is, it does happen. Why Dr. Phil didn't address this aspect, I don't know.