Welcome! My name is***** am a UC Davis graduate, and currently, a Medical Director of a veterinary hospital.
I am sorry to hear about this concern.
Well, if there is no certainty any was ingested or possibly very little, it doesn't appear an ER trip is indicated. I would double check the teeth, gums, and tongue to see if there is any paint residue obvious within the oral cavity.
If not, I would simply monitor for any symptoms of gastrointestinal upset over the next 48 hours.
So, keep an eye
out for any vomiting, diarrhea, loss of appetite, drooling.
If symptoms were to manifest, than a vet visit is well worth it with no delay.
Otherwise, at this point, close observation is all that would be indicated.
Sorry to hear what Bronte did.