Tee hee! Great way to get our attention, Brent!
As far as colors go... I would say that most Hutts are closer to green in back, fading to a light yellowish tan in front. Gardulla's front definitely seems to be a lighter yellowish tan than Jabbas. Some other distinguishing characteristics: she's got a sort of "widow's peak" of the green between her eyes, her nostrils seem to be bigger than Jabba's, and her eyes seem to be more of a golden yellow in color, while Jabba's are more orange.
Gosh, that's a lot of colors, I know! Hope that helps -- and best of luck with this foxy lady!
... the Findswoman