Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with your wee one today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
First, I would just note that nothing in your veggies would have caused Millie any harm. Now can you tell me:
What did she pass in her vomit (ie hair, food, etc)?
Had she passed a large volume of urine on the floor or a small amount?
If you can locate her, are her gums pink or pale/white?
Does her belly have any discomfort, tensing, or pain when you press on it?
Is there anything she could have eaten (ie bone, toy, plant, string, toxin) ?
Has her breathing settled (>30 breaths per minute)?