This one got to me. I can sympathize with her feelings of hopelessness as I am going through something similar. Granted she's older than me, but it seems that we have stuff in common. I have 2 kids, and just purchased 2 boxes of sleeping pills yesterday. No worries, I don't intend to use them in that manner, but I'd be lying if I said that I haven't been taking more than I'm supposed to.
In a way, I'm kind of glad she left a note. The wondering why is so terrible. I hope that her husband and kids are going to be ok, and I hope she's found peace. You never know what someone is going through no matter how together they appear. RIP Jennifer.