With all do respect to our esteemed members who are capable of writing long and eloquent rebuttals of honest people who've watched the partying, lying, etc. of this person and see reasonably that in all likelyhood she bears at least some responsibilty for her daughters' death, I say:
If it quacks like a duck
If it waddles like a duck
If it looks like a duck
And if this duck, at the very least, doesn't keep her child safe, doesn't report her missing for a month, and acts like this person did...
...then it's probably a GodDamn duck!