Actually the article says this happened in Ontario and they have pretty major liquor liability laws. Hosts of an event (bar, concert, house party, work party) where alcohol is served have a duty of care to guests *until the intoxicated person sobers up*, including not letting them get too wasted, trying to convince intoxicated them not to drive, helping them find a safe way home, and calling 911 if they do try to drive.

So, technically they couldn't literally wrestle the keys from the woman but under Ontario law there is a strong chance they will be seen to have some liability for what she did after leaving the venue.