If I got something it wouldn't be anything related to quilting; made or bought. She didn't feel it a necessity to tell you she was pregnant so why should you feel obligated to do as you've done in the past. If anyone says anything you can just say if you'd "told" me sooner I maybe would have had time to make one and leave it at that. The same goes for your sister since she also didn't feel obligated to tell you; you shouldn't feel obligated either.