Now, she has won an legal dispute with Christchurch Casinos Limited after the Employment Relations Authority ruled that her redundancy was not "genuine".
ERA member Helen Doyle said the review process and redundancy procedures adopted by the casino were "inadequate and unfair for a vulnerable employee such as Ms Cooper on parental leave."
Doyle concluded: "I am not satisfied that the redundancy was genuine and I was not satisfied that there was no prospect of Ms Cooper being appointed to a position that was substantially similar to the position held by her at the beginning of her parental leave. The process adopted by the casino was also unfair."
The ERA also ordered the casino to pay Cooper lost wages she was due.
Ms Cooper's mother Barbara provided a statement - that was not challenged by the casino - which said her daughter became "stressed and saddened" about the changes at the casino and had "cried a number of times with the worry".
The ERA determination says: "She (her mother) said that Ms Cooper was excited about her job with the casino and had every intention of resuming her career after parental leave.
"She felt that being offered a demotion was a black mark on her name and that she had put so much effort into her position before the parental leave.
"Ms Cooper is I find entitled to compensation for the humiliation and distress suffered and caused by a redundancy that was not genuine.
" In all the circumstance I am of the view that an appropriate amount for compensation is $12,000 without deduction and I so order."
The casino did not return a request for comment.