I can give you some basic numbers, just to clarify your situation.
Indeed, Monica is quite correct. Among senior women immigrants, whether they live alone or in a family, they do tend to have a much higher incidence of low income than other senior women do. I think currently something like 70%--or at least it was at the time of the 2001 census--of senior immigrant women were below the low-income cut-offs.
The good news, if you can put it in those terms, is that the living arrangements of immigrant women tend to differ quite considerably from native-born women. Senior immigrant women are much more likely to live with their family or with other relatives, so the number of those women who are living alone is actually quite a bit lower than the overall population. It's kind of a mixed bag.