REGULATING PSYCHOLOGISTS IN NOVA SCOTIA SINCE 1980
Category: Registrant

A Driver’s License would be fine. For future, here is the policy (page 4 under change of name heading):

https://www.ns-rp.ca/downloads/RegistrationInformation.pdf

Once you receive this information from her then you can change her name in the database (and QuickBooks).

Reference: 
Name Change