Mom's if your daughter came running up and said a stranger told her that she could have drowned her sister?

no your not wrong! her reaction isnt normal! ill give you a short and simple answer here, she wasnt watching and she darn well knew she wasnt and thats why she got angry at you because one thing that will make people more angry than lies is the truth! and the truth of her not looking after her kids properly and someone else having to interfere before a horrible accident happened would have been enough for her to shout at you like it was your fault it wasnt and dont you dare think that! this lady needs to sort herself out dont loose another nights sleep over it you stopped something that other people where watching too that little girl should have known better than to do that to her sister but i guess if your mums never paying attention how can you know how to behave properly!