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HI this is DRB and I would be happy to help you. Typically hydrangea plants will only cause gastrointestinal irritation with vomiting and potentially diarrhea. Cyanide intoxication from this plant is very rare because most pets don't eat enough for that to happen. The begonia on the other hand can cause intense irritation and burning of lips, mouth and esophagus. Also you can see excessive drooling with this...... if she is quiet now and has stopped vomiting then chances are she will be fine but if there is any more vomiting, lack of appetite, diarrhea or extreme lethargy you should take her to the ER.I hope this helps you. Sincerely, DRB
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