This is a really sad sequence of events. I wish, more than anything, that this young mother could've gotten the help she so desperately needed and cried out for. It's hard to imagine someone doing this, but severe episodes of depression can include some form of psychosis. Psychotic depression can include hallucinations (such as hearing voices) and delusions that create a break from reality, leading to committing these terrible, unthinkable acts that no one would have ever thought her (or anyone in this situation) capable of.
The saddest part to me is that 1 in 4 people admitted to the hospital for depression exhibit psychotic depression, which she may have very well been treated for, if she had gotten the help she needed. It's hard for me to demonize someone who is so clearly hopelessly ill and was left to fend for herself (and 5 children!) alone. The acts committed were horrible, but I can't help but feel for the mother, a victim in her own right. May all these children rest in peace. I hope for anyone to see this and realize it's not too late to get help. moo.