Figures like this were made to be shortpacked.
The only problem with that is due to the build-a-droid, you can't short pack any one figure over the other figures in that same wave that contain the rest of the parts to the same droid.
In Hasbro's defense on this issue, they ONLY Yarna in the Wave 1 cases. It's not like Yarna came mixed in with Wave 3 or Wave 4, so they packed her as lightly as they could under the constraints of the build-a-droid line.
Like Chewie said - figures like this would have been much better if left for a "battle pack" of some kind. They could have given us a ROTJ Jabba's Palace battle pack with an all new Jabba, new Oola and this Yarna figure and the entire set would have sold just based on Jabba alone.
Part of me is glad that they put her on a card since she was one of those figures that "almost" got made in the original Kenner line, but when I look at the sea of Yarna figures that are on the pegs now, I have to worry that her "failure" will eventually get back to Hasbro and deter them from releasing figures of obscure characters like her in the future.
I hope I'm proven wrong, but I think the exact same thing is going to happen with Willrow Hood. About the only reason a kid might want this figure is to complete the droid he has a part of.