BM dress in 2 weeks???

I have a huge problem....my BM was 1 month prego when we ordered the dresses. We ordered it much much bigger knowing she'd put on weight. BUT she put on A LOT more weight than expected and now can't fit into the dress. We ordered the dress from an online shop who can't gaurantee the quick shipment.

Where can we order a Bill Levkoff rush shipped in 2 weeks????????

Please help! Wedding is in 5 weeks!!!!!!!!