[9] The resulting paper, "Expert witnesses under examination in the New Zealand criminal and family courts", was published in March 2013.

[3] The preliminary results released after the election night count placed her 164 votes behind the incumbent MP, National's Shane Reti.

[14] Henderson chaired a sub-committee of the Conversion Practices Prohibition Legislation and voted in favour of the bill.

[15] On 17 March, Henderson announced that she would retire from Parliament at the 2023 New Zealand general election in order to return to her legal career, focusing on court reform and sexual violence.

She said she had not expected to be elected (the Whangārei electorate had been won by National for the previous 45 years) and did not consider the role of a Member of Parliament to be well-aligned with her preference for and skillset in legal research and teaching.