Am I overreacting?

My niece kept trying to hold my one year old yesterday and I kept telling her to please stop because she almost dropped her every single time and she continued to do it and I took my daughter back and then she’d pick her off of the ground. HER MOM WAS SITTING RIGHT NEXT TO ME LISTENING TO ME TELLING HER TO STOP AND DID NOTHING. I told my husband as this is his family and my nieces mom thinks I’m overreacting.

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