J.M.
M., Have you tried propping the head of her crib up a little so she sleeps at little bit of an angle. We had to do that with my son when he was a baby. His pediatrician is the one who recommended it. she said sometimes babies nasal passages aren't fully developed or the tissues are to big and can reduce the opening when they are lying down. It worked for him and he eventually grew out of it. if you have any question please feel free to contact me back.