Yes that’s my point. There’s a bit more of a process from the Canadian land border than at an airport. At an airport, you’d just be turned around and paying for a flight. At the land border - particularly the border between two countries that don’t want you - it’s going to take a bit longer because the logistics are more complicated. Also, there might be some kind of investigation, as she has already been staying in the country for several weeks at this point.

However we should be talking about like 3-4 days at most (if that), not 3 weeks.