Humm... After you mentioned her I too went looking and all the photos out there show a typical rather average built 41 year old woman. Nothing rather remarkable about her build, even by athletic standards. In fact if you look there are actually bustier teammates in her curling crew.
The image attached above is actually the best one to show her figure and much of that is the puffy jacket. So, unless she has had some major figure change this is another example of "they just happen to look large". Ah, does that patch say "TITLIS", oddly appropriate given the BEA track record.
This year for some reason I have absolutely no interest in the Olympics.
Note: It is Erika Brown