thanks for your question.
D-Con poison is very scary as it will definitely kill pets easily. However, the great news is, it does not have any effects for 3-5 days, so if you know a pet ate it, they can definitely be treated easily and the dog will have no ill effects.
You mentioned vitamin K, which is the treatment for this toxin. If we know a dog ate D-Con, first we tend to recommend inducing vomiting, if the dog had the toxin within the last few hours. Activated charcoal is also sometimes given to help absorb it from the gut. However, even if the dog is not treated in these ways, as long as the dog is started on vitamin K and it is given long enough (usually 2-3 weeks minimum) and at the right dose, the dog should be just fine.
Here is some information on this toxin:
Since your dog has already started Vitamin K, all should be well. Make sure to continue her on that as long as your vet recommends and to have her rechecked when the medication is done.
I hope that helps! Thank you! Dr. Marcia