It does sound lime either there are kids in the class who need more help or the teacher is pretty bad. Kids do melt down sometimes but it shouldn't be happening daily. She may be like me in that when something bad happens and she is there she feels she should have been able to prevent it, she may want to protect the child from the teacher ir other children and can't , she may feel she has to fix things (I always want to fix aguements between family and friends - even when they don't have a problem), she could just be exhausted by the environment. You need to try and get her to work out what would fix the problem - and if that is something that can be done.
But please if it is in your power to do so don't let her be crushed by school.
