Very beautiful and stunning Cleo. She looks like a full body colour greywing. The intensity of olive green in her rump marks a FBC with the greyish tail feathers. She also got opaline markings in the head. A great buy, Teezy.
I have a bird practically identical to that and Nev said she was likely a grey green cinnamon combined with either clearwing or greywing. But not opaline. Perhaps yours is the same. He also posted a pic of a bird with that mutation to compare. Here's the link to the thread: https://talkbudgies.com/showthread.php?t=59187