When I ordered my daughter's flower girl dress from David's, they said it would take 8 weeks for the dress and 12 weeks for the sash (and, no, I can't just wait until they're both in, I have to come pick them up when they come in
). I think the dress was there in 2 weeks and the sash in 4 weeks (or maybe even 3), so I wouldn't worry about ordering in October for a JUNE wedding, even if you weren't pregnant. Feb-March should be PLENTY of time. I agree with the others that if she pushes this issue, drop.