Hi thanks for your question
Your girl friend is having swollen throat, difficulty in breathing during sleep and painful deglutition (painful swallow).
All these are symptoms of a condition called as pharyngitis(infection of pharynx)
Since she is having difficulty in breathing, she may be having some degree of laryngitis
She needs a course of antibiotics along with decongestant and anti histaminics.
It is better for her to get consultation from a physician.
Hope I answered your question.