Some breeders do give calcium after all the puppies are born (but not beforehand obviously) but we have never done so & have had only one bitch with eclampsia, which was our v first litter (over 15 years ago) when we innocently followed another breeder's advice to supplement with calcium during pregnancy - a recipe for disaster! I know how frightening eclampsia is but I still prefer not to supplement with calcium at all, unless perhaps the bitch has had a problem before (not sure from your post whether Rosie is the bitch that had eclampsia last time).