Has she tried the Enell? It is a front closure that will fully lock and load and offers maximum support. It is geared to larger sizes, C to D's and beyond. I've just purchased one as I'm nursing and needed more support than my CWX could offer. However, I will be getting it altered as the shoulder strap is a bit too long. Bought mine in Calgary.

My sister got the DD's in our family and uses this one from moving comfort http://www.movingcomfort.com/...00272/_/Grace_DD_Bra

I think she found it at Running Free (she is in Barrie.)

HTH