I've just started to read through the (original) instruction and D-E as a quarter of B-C is clearly wrong - in their drawing, and on the model, there's no way the upper finished edge is half-way between bust point and neck edge, and when it's doubled for F-O you end up back at the waist, not the empire line the dress is supposed to be.

I'm not sure I'm willing to guess what D-E should be instead without reading further through the instructions and trying to reverse engineer the finished product to determine what they originally meant.

(Also, I've done some pattern drafting from measurements and oh-boy this is badly thought-through, someone who doesn't properly understand drafting. So I fully expect to find further errors.)