Lucy Loomoo

Lucy Loomoo Nungurrayi, an Australian Aboriginal artist, born circa 1935, who worked in oils and acrylics.
The Art Sales Digest page says it has recorded her auction sales since 1994, with 12 works listed and 9 sold at the time shown. It also says her highest recorded auction price was $4,200, for Bush Food Dreaming, sold by Lawson-Menzies (now trading as Menzies) in November 2005.
It also records that her work is represented in the National Gallery of Australia and lists her in biographical references including Max Germaine’s A Dictionary of Women Artists of Australia and Australian Prints + Printmaking.
For your website, I would keep the Warlayirti certificate as the primary source for the artwork and its original story, and use this Art Sales Digest information only as supplementary artist/market history.