Gladys Reynell (September 4, 1881–November 16, 1956) was a painter, printmaker, and one of South Australia’s earliest potters.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Gladys_Reynell

Left: The cow jumped over the moon jug / 1921 / Glazed earthenware / NGA, Canberra
Right: Still Life / ND / Hand Coloured Woodblock / Private collection

Gladys Reynell on Artnet: http://www.artnet.com/artists/gladys-osborne-reynell/

Further reading:
https://www.agsa.sa.gov.au/education/resources-educators/resources-educators-australian-art/gladys-reynell/
https://adb.anu.edu.au/biography/reynell-gladys-8187
https://www.fieldstobarrels.com/posts/reynella-pottery/