Hi Sept15, hello Stork1 !
Well, how would I go about it! The purpose is to always be clear so that the CIC official doesn't get confused, right ?
On the citizenship form, you have a place where you can write previous or other names ( In my case for example, I currently have two nationalities and a different name in each! ) So, I am living in Canada as a citizen of country number 1, and that's the same name on my PR and everything, however, I had to include a copy of my passport from country 2, so I told CIC about my other name on the form. Now, if you think that Mrs. Sept15's case is more complicated, I suggest that you make it clear by writing a letter to explain whatever you think you should explain, without going through the boring details or anything.. They are not dumb, they will realize that AD , CA and AB is the same person when looking at her papers, her place and date of birth and her relation to you, the only thing that really counts for them is that her name in her future canadian citizenship will have to look like her name in her PR file ( when a name change is requested, they keep traces of the previous name...but they always function with the name you had a life with in Canada...)