In fairness, some heifers kick their own calves off at first; it must be a very strange feeling, when it's your first time! Just cake her while you get the foster calf sucking, and support feeds several times a day until you see it suckling on its own, and/or it has a full tummy every time you see it.
It won't hurt to skin the dead calf and jacket the new one, but in truth, with a bereaved cow (or ewe), they'll usually take a foster after a day or two, jacketed or not.