Periwinkle Bridesmaid Dress

I`m trying to help my daughter out by finding one more bridesmaid dress. The groom`s sister really wants to be in the wedding and my daughter, Heather, doesn`t want to disappoint her. Can anyone help me? The dress is periwinkle, it criss-crosses in the back, has a short train with flower beading, and is strapless with some flower beading in the front. The brand name is Rampage. We are looking for a size 9, or a size we could have altered. At this point, my daughter would be okay with at least having the same color dress and material type (strapless or spaghetti). The wedding is November l5th of this year, so she`s feeling desperate. Any help here would be greatly appreciated. Thanks.