My concern is that even in the first photo where she is on the newspaper (above the one where you are holding her), her jaw is not closed properly, so it is not a question of how she was being held. This may have nothing to do with breeding, prior health issues, or the length of QT (though I do not condone a 30 day QT). If she somehow damaged the inside of her mouth while feeding, the naturally present bacteria could have taken hold and developed an abscess or this may be swelling from a less localized infection. Regardless she needs medical intervention (and probably heavy antibiotics) at this point, if that swelling gets worse it could compromise her airway, or the infection (whether URI or abscess or whatever that is) goes systemic, she could die.
