I see that you have gone off line. I will give you some general information. Please let me know if you have specific questions based upon my response.
If it has already been 2 hours it is likely the chocolate is out of her stomach and it is probably too late to induce vomiting.
At this point you cannot change things much at home, all you can do is watch her for further symptoms now.
I would encourage you to get her to drink as much as possible and to get her out to urinate frequently. Chocolate toxins are metabolized out through the kidneys and can be reabsorbed from the bladder so we don't want them to sit in her bladder for long.
In most cases mild chocolate toxicity is out of their system in 24 to 48 hours. We generally begin to see symptoms, if they eat a toxic amount, within 4 to 6 hours.
It may help to with-hold food for the next 12 hours to stop intestinal spasms.
If she seems at all nauseous to try and settle her stomach you can give either:
1) Pepcid ac (famotidine
) at ¼ of a 10mg tablet per 5 to 10 pounds of body weight every 12 hours
2) Prilosec (omeprazole) at ¼ of a 10mg tablet per 5 to 10 pounds of body weight every 24 hours
These are acid reducers and should help her feel less nauseous. They are quite safe and can be used for several days if needed.
Then after her 12 hours food fast to decrease the symptoms of stomach upset you can feed her a bland diet for the next couple of days. A homemade bland diet is a mix of 1/3 boiled minced white skinless chicken
or lean boiled hamburger and 2/3 boiled white rice mixed with some low salt chicken broth to make it easy to lap up and swallow. Feed small meals frequently.
If you do notice a very rapid heart rate (more than 160 beats per minute in a small dog) repetitive tremors or seizures then she should be seen by a veterinarian on an emergency basis for treatment. They can use injectable medications to control her heart rate and stop the seizures until the toxic levels fall.
Best of luck with your girl, please let me know if you have any further questions.