Welcome! My name isXXXXX am a 2003 graduate, and currently a Medical Director of a veterinary hospital.
I am sorry to hear about this concern for Addy.
Well, the good news is that with this type of chocolate ingestion, the more severe symptoms of possible seizures probably has past.
However, it was enough chocolate to certainly cause the hyperactivity, as well as, may still predispose to vomiting and bad diarrhea.
You could try giving benadryl, but I cannot be certain it will help to take the edge off.
Benadryl can be given at a dose of 1mg per pound of body weight. Keep in mind, Benadryl tablets and liquids come in different sizes. So, an approximately 25 pound dog can get a full 25mg tablet or a half of a 50mg tablet. I usually avoid the liquid Benadryl in larger dogs (you would have to give too much of it).
I can't be certain if she will get worse over the next 12 hours, so an emergency vet visit may truly be necessary. Treatment may also include some fluid therapy to help flush out the body.
Very sorry to hear Addy.
Definitely keep a close eye on her.
Here are some extra links and general information as well:Chocolate Toxicity Chocolate toxicity 2 Toxicity Calculator
The last link above is a very nice interactive site to help you understand the toxic effects of different types of chocolate depending on a pet's body weight. A bit dificult to use in this case since it was a mixed type of chocolate she ingested.
I hope that information has been helpful.
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