Poor child, poor cat 
I had my nieces and nephews round today, there's a lot of them and they're very noisy. I supervised them all with the cat and ordered them to stay out of my room so she had somewhere to hide.
I thought the cat had slunk off to sleep somewhere so I went downstairs. A little later on I heard a howl. My 3 year old had gone to stroke her and she'd lashed out and caught her a cracker right by her eye. She was devastated. Although the cat has apparently now said sorry so they're friends again!
Supervising a cat around children constantly is really hard isn't it?! I don't think DD had been particularly rough but I suspect she was right up in her face and she felt backed into a corner and a bit freaked out by everyone. Wish my house was bigger, it might be easier to separate them!