[9] In 2014 at the encouragement of the Smithsonian Transcription Center she began working on Wikipedia; her first article, on botanist and collector Charlotte Cortlandt Ellis, was quickly flagged for deletion.

[2][12] She was spending at least two hours a day on Wikipedia, Wikimedia Commons,[13] Wikidata,[14] and iNaturalist,[15] and organised several volunteer events with Wikipedian Mike Dickison.

[20] In 2018 she was awarded a travel scholarship to present at the WikiCite conference in Berkeley, where she spoke about the difficulties of finding metadata on historical biodiversity literature.

[24] Leachman actively contributes to Wikipedia, Wikimedia Commons, and Wikidata, focusing on topics like New Zealand's natural history and underrepresented figures in science.

She frequently speaks at conferences and workshops, emphasizing the need to close tue gender gap in science representation and ensure the inclusion of indigenous knowledge systems.