Oh, right! I had totally forgot that Giselle was actually animated at the beginning of the movie (and maybe also at the end of it? It's been years since I've seen it so I can't remember well). And she had quite a very pretty design at that.
She never went back to toon world. The prince she broke up with went back home with that reporter or whatever she was, the ex-girlfriend of the guy Giselle ended up with.