The dose is 1 tsp. per 10 poinds.
If it has been less than an hour, it should work.
This is what I'd do for Ellie, but your vet may say differently.
She should be fine, but the toxic grape dose isn't really even known, so I'd err on the side of caution. If the emergency vet thought that vomiting needed to be induced and charcoal given, I would at least induce. It would not hurt to take her. That is a very hard call. I'm sorry.
I see it didn't work. You can redose.