I think they check the lungs - water fills the airways differently when a drowning person breaths it in. A dead body placed later can not breathe it in.
If this is something she did regularly she could have just gone through the motion, like dropping children to school or joining that call. Or, she could have viewed it as one last parenting act? If her mental health was suffering not every action will be completely rational.
Just to clarify...
They don't have to, but in the past police in UK have released it. As an example see the still active case of Nathan Cole. Police released every footage they had of him; in the bus, walking, in a store.
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