For suspicion Anne's mom should be 100% clear; the children disappeared after school and never came home.
For suffering, I mean Anne and her friends completely on her birthday without a trace. The investigators will find graffiti of their names but not much else. The assumption here will probably be that the three girls got abducted. All this is assuming no Narnia time>Tulip
She wasn't even gone long enough to raise eyebrows, right? I don't think she suffered at all. But, if she was gone for a long period, then she and her husband would definitely be suspects.>Luz
I could see Camila being under suspicion of murder. Luz was a friendless loner and she constantly went to the principal's office. Being a nurse is a pretty stressful job. It doesn't take much imagination to theorize that Camila snapped. Essentially just getting fed up with her daughter's nonstop acting out, she tells everyone she's sending Luz to camp, when in reality she takes her out in the woods and puts her out of her misery.
Having said that, I'm sure she would suffer, but Luz has been sending her messages for weeks, so it's pretty clear Luz ran away.