Oh I have absolutely no doubt YOU do watch her closely
I know how much you love your little ones :P The wheel can usually stay in until the night before birth - it is just to stop her dragging a pup into it still attached to her nipple - though they are generally far too busy to bother with wheels in the first few days
The pups have two little fang like teeth which they use to help suction themselves onto a nipple therefore they can often be dragged out the nest still attached. Good luck, not many hours left to wait I wouldn't have thought now :P