I think, in my opinion, the reason why they issue open work permit to her is prolly she applied for it too. I mean you kinda have too especially if you're inside Canada with an expiring work permit so you'll be able to get the implied status. That's kinda what I had to do as well. I submitted my PR application Dec2019 and then 3 months before my work permit expire (they only recommend 30 days actually before expiry) I applied for BOWP and up until now I'm under implied status. That is very important especially if you choose to stay inside while waiting for PR approval. Also it gives you an advantage to work for whatever and how many jobs you want while waiting for PR approval. PR processing is dead long, I'm pretty sure after eligibility next would be medical then last one is interview...