Artificial sweetener ingestion.

This morning I ate an atkins bar for breakfast. I left the wrapper on the couch and came home about 3 to 4 hours later. When I got home, I noticed that my dog had licked the inside of the wrapper (which contained "diet" chocolate). She couldn't have gotten much, but I am concerned that the artificial sweeteners in the chocolate might be harmful to her. She's acting fine, but I'm not sure how long it's been since she ingested the chocolate. Should I be worried?

Here is a list of the ingredients in the bar:
Soy Nuggets (Soy Protein Isolate, Oat Flour, Calcium Carbonate), Glycerine, Polydextrose, Hydrolyzed Collagen, Chocolate Chips [Maltitol, Chocolate Liquor (Processed With Alkali), Cocoa Butter, Soy Lecithin, Vanilla Extract], Rolled Oats, Palm Kernel and Palm Oil, Sunflower Oil, Whey Protein Isolate, Cocoa Powder (Processed With Alkali), Soy Nuts, Roasted Almonds, Coconut, Natural and Artificial Flavors, Whole Milk Powder, Cellulose, Soy Lecithin, Salt, Sucralose, Acesulfame Potassium and Vitamin Mineral Mix (Tricalcium Phosphate, Calcium Carbonate, Magnesium Oxide, Vitamin A Palmitate, Ascorbic Acid, Sodium Ascorbate, Thiamine Mononitrate, Riboflavin, Pyridoxine Hydrochloride, Cyanocobalamin, D-l Alpha Tocopheryl Acetate, Niacinamide, Biotin, D-calcium Pantothenate, Zinc Oxide, Folic Acid, Chromium Chelate, Phytonadione, Sodium Selenite).