Here's the facts, in some states you have to prove that you were trying to retreat before using deadly force, even though it was a warning shot, you have to prove that you were trying to get away. Second, shooting in the air doesn't help, the bullet has to come down, its not like hollywood where a bullet keeps going up and up and never comes back down. The bullet will come down and could injure someone or something. That was all her fault. She misused a firearm and she should know better.
Now, was there time to call the police, probably not, but shooting a gun in the air shouldn't have been her first move. She should've tried to get their attention by her voice before firing the gun. I think she had the right to defend herself and her daughter, its just that i think she went in the wrong order of things. She shouldn't go to jail over it but she should take some sort of safety course