Sponsoring my US resident wife
 

I am a Canadian citizen. I am planning to sponsor my wife who is a US
permanent resident. She will be a US citizen in 5 months. Should I wait
for her to become a US citizen before I apply for her Canadian PR or should
I apply right away ?

Would getting a Canadian PR have an adverse effect on her US status?

On Canadian PR application, they ask for the proof that we were seeing each
other, like passport stamps or boarding passes, etc. In our case, we were
driving across the border to see each other and they never stamped our
passports and hence we have no material proof. Would this be a problem?
We have two kids who are US citizens.

Thanks for any advice.