Eating two mice in one sitting won't hurt her...but there's a good chance she'll be "full" for awhile and may miss the next feeding or two. Don't be too worried if she does.
As for the little bit of stuck shed...don't worry about it. For sure, don't try to do anything about it for the next 48 hours, at least...she needs plenty of time to digest that big meal before you mess with her. It won't hurt to just leave it alone completely and let her rub it off herself or wait for the next shed.