Hi,
Of course your girl friend has to answer the brief questions asked by the officer at POE. Then the officer will decide how long she should be permitted to stay in Canada which will be up to 6 months. I don't suggest to hide anything from the officer because there could be tricky questions if the officer suspect about the intention of the visitor and will result to a decision allowing her to stay up to the date of her return ticket. There is no harm if she tell that she quit the job for visit and will find another job when she return.
Yeah she thought about saying she's between jobs (which isn't really a lie), but how big is the chance that she won't be let in if she says that? Yes I am very nervous!
I guess the reason why I'm so scared is because I tried to enter the US to see her a couple of months ago and the border officer was terrible! She treated me like *censored word*! She asked me if I had a job and I said no and she asked me where I lived and I said with my parents, I told the truth and I wasn't let in! I was also very nervous and it wasn't hard to tell, but the whole thing made me feel like border officers don't need a good reason not to let someone in. I keep hearing that Canada border officers are nowhere near as bad as US border officers though...