I could be wrong, but I think she just means that she took sheets of cake and trimmed them slightly into wedge shapes.
I think it would be the same concept as the topsy turvy cakes, just not to that extreme. You also have the option of just shaving the cake down to look like a wedge, depending on how extreme you want the angle and how much cake you have to work with.
Sharon Zambito did a tutorial on wedging a cake a couple of years ago. She uses styrofoam, cut into wedges.
It is called the Graduation Wedge Cake. It was posted on her blog of Tuesday May 19, '09.
I hope this helps.
The bag would have been done the same way you make a normal topsy turvy. Cut the cake at an angle and flip it over to exaggerate the angle, and so you don't waste any cake.
Boy, that is what I get for not taking the time, (I have an incredibly slow dial-up) to look at a link. Yet I will spend lots of frustrating time looking up an old post when I heard the word "wedge". I do agree with the above. You split it just as if you were making a topsy turvy. Sorry for going so far off track. By the way, it is a beautiful cake.
I know, it's a gorgeous cake isn't it?
Thanks to everyone for the help! Ive never done a topsy turvy, since I'm still a beginner, but I know what you're talking about.
I wont be able to compare to the original, but I'm going to give it a go this weekend. I'll post a link to show you how it turns out.