Agree. I think - because the the more time passes, the more likely it is Evelyn is dead (and it’s painful to see those words together) - this was
likely an accident, probably due to negligence (because you’d think MB would otherwise have contacted a hospital). I don’t see Evelyn’s mother as a cold-blooded killer. I do see her as somebody who has tangled herself in so many lies, she no longer knows where to turn. And there’s only one reason she can’t bring herself to tell the truth. IMO JMO
I have a tendency to agree with "accident" but, in the form of a loss of temper on MB's part that resulted in Evelyn's death. It seems that MB was dealing with at least 2 major stressors during the time Evelyn was last seen by anyone... Having to leave the trailer
and trying to finagle her way into HW's basement apartment (with many prizes resulting.) Yet... there's Evelyn preventing her from getting her way. MB's "broken arm story" might be true or not but we know there was not even a slight arm injury that occurred while Evelyn
was not with EP. But, I think there was, at least, a bad arm injury. (Unless MB made it up to try and muster up sympathy from HW.)
Evelyn was not only preventing MB's plans from coming true... but now, during a certain fateful moment, Evelyn was being a brat on top of it. I can almost hear MB's thoughts...
"I
have to have HW but I can't have him because of
you! You're what I get out of this whole situation and you've ruined my life. I don't want you. I want him."
(And, MB would be constantly churning this over and over in her mind. Enter Evelyn refusing to do this or that... whining about something and possibly just having a little temper tantrum of her own... and MB taking all her anger and frustration out on the "object" that was the cause of it all.)
"I want the guy and the house and I don't want
this and I can't have what I want until
this is gone."
That would be premeditated, too, in it's own way (lashing out violently enough to kill a child) and because, in a way it
was pre-planned... in that; I think there was a series of days that took place where MB
daydreamed and imagined of Evelyn being gone somehow... and with MB getting her own way in having HW take Evelyn's place as MB's wished-for result. And then; everything would be good again in MB's daydream world. MB and HW would live happily ever after. But, of all the unpleasant surprises! ...
~Not The End~