Given the size of your dog, and relatively small amount of chocolate (compared to the dog) it's most likely OK. Here's a link with information about chocolate poisoning: http://vetmedicine.about.com/cs/nutritiondogs/a/chocolatetoxici.htmSince your dog is 100 lbs, (45.5 kg), using the low figure of 20mg/Kg of theobromine, your dog would have to ingest about 900 mg. of theobromine, or somewhere around two ounces of unsweetened chocolate. Your dog got a little over one ounce of choclate, so you're probably OK., according to this source.Still, different dogs may react differently. Some may be more sensitive, some less so. And the 20 mg/Kg is a very conservative number. Just keep an eye on her for the symptoms listed, and if she starts showing any of them, call your vet.