What Causes Swollen Eyes,lips And Feet After An Insect Bite?

my girlfriend was bit by something that looked like a aunt with wings. 10 mins later her eyes lips feet and toes were swollen and getting worse, itchy very bad under the arms, bottom of her feet. she was bit on her neck, under her arm, and under her left brest, was taking by amculance to the ER for treatment, just curious as to what could have bit her...