Ms Fisher denied swearing at the children when questioned by their mother.
Later, at a family meeting involving Ms Fisher, her employer said she told Ms Fisher it was "scary to speed".
The final incident occurred on June 22, 2011 when Ms Fisher was caring for the five children along with three others while the O'Briens went to dinner with friends.
"There was some discord which led to both Ms Fisher and one of the children telephoning Ms O'Brien during dinner expressing their discontent," said the finding.
The next morning Ms O'Brien texted Ms Fisher saying the employment arrangement could not continue because it was too hard. She told the ERA she thought she could end the employment in this way because she believed it was a casual arrangement.
However, Mr Loftus concluded Ms Fisher had an ongoing employment relationship with Ms O'Brien "which means the decision to terminate was a dismissal" so she was required to justify her decision.
Ms Fisher was unfairly dismissed because her employer didn't discuss the issues with her and there was no attempt to find out what happened or why the decision to dismiss was made, Mr Loftus found.
He ordered Ms O'Brien to pay Ms Fisher $1779 in lost wages and $4000 as compensation for humiliation and hurt feelings.