Vancouver Airport has Chinese speaking staff at the gate. You can see them / hear them as soon as the passengers walk off the plane. Also, 95% of passengers on the flight are Chinese. Just grab someone while she is at the airport. It is probably easier that way.
What can be really helpful is that you get somebody to get you a Canadian Custom form - the one that is usually handed out to every passenger on the plane. You can fill it out for her and mail it to her. I believer that is the only paperwork that she has to deal with.