I am happy that Lafilia ends up getting along with Ellen, but her behavior can largely honestly be tracked back to her father's incompetence at being, well, a father.
He doesn't spare her a moment whilst he gives Ellen excessive amount of his time, even when there is no call for it, he uses shitty reasons for avoiding Lafilia and then expects a kid to understand something as being "adults have to work" when it is literally him being childish and running away from his responsibility towards her.
She may have misbehaved, but if there is anyone that should be apologising loudest of all. It should be him.
Lafilia is a child, she may have done some stuff wrong, but nothing in comparison to the negligence of her father.