我在网上查到，是无法延期的。加政府虽然禁止非必需的旅客进入加拿大，但并不包括像你母亲有登陆纸的人。如果你母亲收到的批准的书面通知是在3月18日之前签署的，你母亲是可以进入加拿大的。
“Extensions to landing dates are almost never granted. It's use it or lose it. ”
Restrictions and exemptions for foreign nationals：
immediate family members of a Canadian citizen or a permanent resident, which refers to a:
- spouse or common-law partner
- dependent child of the person or of the person’s spouse or common-law partner
- dependent child of a dependent child
- parent or step-parent of the person or of the person’s spouse or common-law partner
- guardian or tutor
- a person whose application for permanent residence was approved and who received written notice of the approval before 12 pm EDT on March 18, 2020, but who has not yet become a permanent resident。
How can I extend my landing date?
I know the question in the title is a little strange. My medicals are valid until January 2020, and I got my PPR. Due to my situation, I can't land in Canada by January 2020, so I'm planning on asking for an extension. Should I ask for this after getting my CoPR, or before? Should I contact...
COVID-19: Canada’s response - Canada.ca
How the Government of Canada is responding to COVID-19 including: economic and financial support, travel measures, for Canadians abroad, public education, collaboration, research, clinical trials, drug and medical device supply monitoring.