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Nope, they never asked her for one. She is exempt from medical as she is American.

"Review of medical results
  • You do not need a medical exam. We will send you a message if this changes."

Visa-exempt visitors applying for a super visa:​

If you are a citizen of a country where you do not require a visa to visit Canada, you do not have to pay any processing fees. However you will have to satisfy all other requirements to obtain a super visa.
 
Very odd! This is exactly what is on her page when she logs in! So maybe not?

"Review of medical results
  • You do not need a medical exam. We will send you a message if this changes."
It says that for all applications unless you did upfront. It will ask for one when your application is reviewed.