New Zealand Law
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You could certainly argue this in the settlement, although the Property Relationships Act does have equal sharing. To argue for less than equal shares, you would need to show particular circumstances under Zection 13
13Exception to equal sharing
(1)If the court considers that there are extraordinary circumstances that make equal sharing of property or money under section 11 or section 11A or section 11B or section 12 repugnant to justice, the share of each spouse or partner in that property or money is to be determined in accordance with the contribution of each spouse to the marriage or of each civil union partner to the civil union or of each de facto partner to the de facto relationship.
(2)This section is subject to sections 14 to 17A.
So you need to show her negligence was very bad, and much more than just a mistake. The courts have set a high threshold for this and it may not be easy