Gardulla is a Hutt crime lord and member of the Hutt Council. StarWars.com records the detail that matters most: she "was the original owner of Shmi and Anakin Skywalker, but lost them betting with the junk dealer Watto", and watched her former slave win the Boonta Eve Classic from the stands alongside Jabba.
That single fact makes her one of the more quietly consequential figures in the prequels — the Skywalkers were a wager settled between a Hutt and a junk dealer. She recurs in The Clone Wars, where the Council hires Cad Bane to extract Ziro the Hutt from a Republic prison and then to hunt him down after he escapes her palace on Nal Hutta.
Catalogue entry. This figure has a verified record here rather than a full write-up — the encyclopedia labels its own depth instead of padding it.