Entering Canada while waiting for PR

[Aguaymanto]

So my wife and I have applied for spousal sponsorship but are planning to wait for it in Canada. Before we applied for the PR however I made sure she got a tourist visa as I've read it can be hard to receive while waiting for PR. My question is that when we go there we will be in Canada only a week and after that we will be in the USA for two weeks then going back to Canada, what should we tell the border officers and do you guys forsee any problems with this? Thanks.