I just picked up this address from her refusal letter.The visa office in your mom's home country + any other global visa offices = IRCC (not only CPC-O)
BTW...just starting to apply for her ETA. There is a question..."have you ever been refused a visa or work permit or denied entry to, or asked to leave Canada or any country ?". Should I select "Yes" and paste the reason that was given by the officer for her TRV refusal?