Thank you for your query.
I can understand your concern. A 11 month old child puts a lot of things in the mouth without one's knowing and must have contracted a stomach bug. You need not blame blackberries or milk for the vomiting
. I suggest you give her an anti-emetic like syrup ondansetron
2.5 ml. stat. In case she vomits again and develops loose motions then you may have to consult a doctor. Also ensure that she has plenty of liquids to drink in the form of fresh lemonade, buttermilk, etc. so that she does not get dehydrated.
I hope I have answered your query to your satisfaction.
Wishing your daughter an early recovery.