Because this entire situation is freaking her out, but for once Tangram is freaking out more than her and also if this baby is left totally uncared-for it might literally die?? So her brain hits the emergency override button and slams her entire mental state behind six inches of glass.
That's why we take care all of the basic needs and then rock it until it goes to sleep. And then we scream, quietly, where the baby can't hear it and sense weakness.
baby is broken, it's too SMALL