Just wondering if the little girl done something to mia while your back was turned.A two year old only has to grab at your baby for your baby to give her a warning growl.
What do your instincts tell you on this? Is that totally out of character for Mia or can she be a bit snappy at times?
How well do you know the mum of the toddler ,would she tell you the truth if her little girl accidentally hurt your Mia?
When my first dog, a border collie had her ears pulled as a pup by a toddler,she could never be 100% trusted with little kids again as she thought they all wanted to hurt her.