I'm afraid that doesn't compute. On the one hand you're saying she was concerned enough about the crying to do more frequent checks, but on the other you are implying that by sitting with her back to the apartment and leaving her child to come and find her if she was upset again that she couldn't give a shit whether she cried or not. So - which is it, in your opinion?
She makes the contradiction here.
She references her concern for Maddie's welfare & leaving the doors unlocked, on the same night by tragic coincidence Maddie disappears, yet she had sat with her back to the apartment.
Maybe she asked Russell to swap chairs & he refused, but I haven't seen that claimed anywhere & sitting with your back to the unlocked apartment door behind which are the children you're concerned about doesn't make sense to me.
But I suppose, if she's weird enough to do something like that then maybe she wasn't checking the children more frequently upon increased concern for them.