When Heidi is being taken to the emergency room for treatment of poisoning, the poisonous substance, if any is left and the poisonous container should be sent with her.
The poisonous substance and the poisonous container should be sent with Heidi when she is being taken to the emergency room. This is because the doctor will examine it to know what kind of poison it is and whether the condition of a Heidi is critical or not.
The doctor then gives antidotes which prevent the poison from working or reverse its effects. The sedatives may also be given if the person is agitated, and a ventilator may be used if the person stops breathing.
Hence, the answer is given and explained above.
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