Is it convenient for Chinese Americans to apply for permanent residence in Canada from the United States?

Amy should apply for a transit visa at the American embassy or consulate in Canada.

Only after being naturalized in Canada, you don't need a visa to study, work and live in the United States, just like immigrating to the United States.

The following passage is a question answered by the visa officer of the US Embassy in Beijing. You can refer to-

Applicants with Canadian green cards can apply for visas in Beijing, but we do not encourage them to do so, because it is difficult to prove that they have strong social and economic ties in China because they have permanently resided in Canada.