Yes it is interesting, and another point is that UK processes approx 4000 applicants from Pakistan yearly, and Canada 10,000-12,000 yearly.
I think the wait times for some VO's are rediculous, Pakistan being one of them, and Singapore following closely at 30 months. It is true that no one should wait this long, unless of owns fault by not provided CIC with the required information.
Now with respect to the OP, her case does not seem like the straightforward family class sponsorship. She is the mother of the kids that are abroad, why? She escaped as a refugee leaving her kids behind? Probably the case. Was there misrepresentation of not declaring husband and kids? Maybe. I think her case is under family class H & C.