Ms Clark filed a complaint with the Employment Relations Authority on September 22, 2014.
She told the authority her employer did not sufficiently investigate the allegations and did not give her a reasonable opportunity to respond to their concerns before dismissing her.
Ms Clark asserted a "reconstructed" schedule of her hours were put together during the disciplinary meeting.
Human resources adviser Michelle Thompson told the authority Ms Clark was given "a full, fair and repeated" opportunity to respond and was offered assistance and training but chose to decline those offers.
Authority member Tania Tetitaha found the serious misconduct leading to Ms Clark's dismissal was "timesheet fraud only" but concluded there was insufficient investigation into the allegations.
"I also conclude the respondent's concerns were not properly raised to allow this applicant [Ms Clark] a reasonable opportunity to respond... the information before the applicant and decision-maker at the time was erroneous and inadequate."
Ms Tetitaha ruled that having regard to the disciplinary history between the parties, there was behaviour [by Ms Clark ] which was "both causative and blameworthy" and required a 50 per cent reduction to the award.
Timeline
October 24, 2008: Began work as a merchandiser
November 2012: Disciplinary procedure & first written warning
September 2013: Disciplinary procedure & second written warning
November 10, 2013: Investigation in timesheets and call cycle complaint
November 28, 2013: Disciplinary meeting held and dismissal