Welcome! Thanks for asking your question. My name is***** am a licensed veterinarian and I will be assisting you today. First I need to ask you a few questions so that I can be well informed and give you the best advice.
1- How much does your dog weigh?
2- How many raisins did he/she eat?
3- How long has it been since eat the raisins?
4- Do you have hydrogen peroxide 3%?
Friend, raisins are toxic to dogs as you already know so make sure you let your friends at work know that this is no laughing matter. Toxicity is very dependent on the amount consumed and weight of the dog. The lowest toxic dose reported in dogs to cause acute renal failure is 0.11 oz/kg. If you can get a weight on her to calculate her toxic dose and see if she is at risk for renal failure would be fantastic. You are right, it is too late to induce vomiting at this point we first need to find out the toxic dose. I will be waiting on her weight.