Db1980 said:
Maybe a stupid comment, but our plan was to go to Florida a couple weeks after our arrival to Canada (relax and settle down a bit before our new life in Canada). Is my wife able to go? The 4 of us would go to FLA for a couple weeks and visit my mother who spends the winter down south.
Not stupid, it is a perfectly sensible question!
That could be a problem! Would you intend to fly or go by road?
The 'problem' is that your wife wont have the treasured PR card for at least 4 - 6 weeks following your landing (and maybe more).
If travelling by road, easy enough to go to the US. On return to Canada, she will not have the PR card to prove she is a permanent resident. She should take her copy of the CoPR, so CBSA can check this and look her up on the system to prove she is PR and let her back through. Travelling by road is not as crazy as it sounds, sure it is a good two or more days solid driving and boring, but apart from a few nasty choke points, driving in the US and Canada is a lot easier than the UK - you can even get to use that funny cruise control thingy without turning it on and off every 30 seconds or so - and at least you have a car while you are down there (of course would have to buy a car and sort your provincial licence first, but doable)! Simples!!!
BUT (deep breath......)
If travelling by air (to anywhere outside Canada), when she tries to get on the plane back to Canada, as she is from a visa exempt country / passport (UK), the airline will almost certainly INSIST on either a PR Card OR an ETA (one or the other - nothing in between!). Once she has applied for PR, any ETA she has / had should be automatically cancelled and you cannot apply for an ETA if you are a permanent resident (can you see how this will go around in circles?), but you do not have the PR Card that proves to the airline that you really are PR. You can try to show them a copy of your CoPR, but others experience to date has shown that this doesn't seem to cut any ice. Bottom line is that the airline may not even allow her to board the return flight, even though CBSA would probably be happy!
BUT - once she has her PR Card, just take that with you as well as her passport and guard them both with your lives. Pretty simple once you have it.