Well she may not bag up yet, you said she's two weeks away approximately? Have you double checked breeding dates? Is this the first time you've foaled her, or did you foal her out before? If so, did you keep record of bag changes with the first foaling? Can you get some photos of her to share? Sorry for the 50 questions lol, she may just be the type of mare to wait until closer to foaling to actually bag, heck you may go out one day, she have a huge udder and drop the foal a few hours later, or she could just wait until after she foals after the oxytocin has really kicked in (oxytocin is a hormone that stimulates contractions and milk let down for those who didn't know)