No, it doesn't mean that. In her one visit to Trenzalore in "The Name of the Doctor", Clara gave rise to many "echoes" of herself ("thousands", she said). Oswin Oswald in "Asylum of the Daleks" was one of those "echoes" & Victorian Clara in "The Snowmen" was another. The Clara who spoke to the First Doctor on Gallifrey in "The Name of the Doctor" was a third.