No, your questions are not dumb LOL. They are pertinent questions.
To answer your questions:
1. Yes
2. Yes. Even if you dodn't tell IRCC, they would know about her PR application. But, you must mention it.
3. Medicals are not required for the TRV/visitor visa. Her current medicals are already on the system.
Do ensure that your wife demonstrates some strong ties to return home to: Employment/business + property ownership or a lease agreement in her name + good financial situation without borrowing from anyone, etc