Ok that might be a reason. Sucks that my mom just went back to Korea a week ago. And it will take 18 week for rcmp to process it ( outside canada application)Maybe your mom has a similar name or date of birth with the person who has a criminal record. By doing fingerprints, they can check if it's same person or not. It shouldn't be a big deal as long as your mother has no criminal record.
Also, create my cic account to check the status. Also, confirm with cic if medicals needs to be done for you mother too or not.