Did some checking (on the infallable internet) and confirmed that there are about five measuring systems for cup size, and in some cases they vary. However, the chart told me that a DD is a DD whichever system you use. Then I checked on her height, with one site saying she is 5'5" and two others saying she is 5'7". So I guess to my eyes she is fairly short in proportion to her chest. Now we can put this subject to bed.