Hi hazey
I'm a relative newby to diabetes but have been looking at artificial sweetners for a couple of weeks now - all I know about sucralose is that it is a chemically altered sweetner and some people here use it some not. If you type sucralose into the search function you will find lots of threads discussing this and other sweetners. I am sure someone with more knowledge and experience will come along and give you more info. Personally, I wouldn't touch anything ending is 'ose'.
Also look at Zsweet if your wife wants to use sugar in baking - its good and diabetics can use this in baking and adding to coffee etc.
Rita