Diggy ate chocolate before and quite a bit more than chanel did so I really think your fine. Darker chocolate is a lot more toxic than say milk chocolate or a tootsie roll. If this ever happens again give a 1/2 tbsp of peroxide and induce vomiting but thats only if you catch it in the first 1/2 hour to 45 minutes after that its too late but if she vomitted on her own thats just her bodys way of getting rid of what her body is not accepting. Im glad she was sleeping and is better now