Mom's lips swollen up... like, bad

My mom's lips are swollen up really bad because of some sort of allergic reaction. It's happened before, and it just went away overnight. She took a few Benadryl pills, which we had to run to Wal-Mart at midnight for. She considered going to the emergency room, but decided to just tough it out. Those huge lips look even funnier in person. Like a collagen inplant gone horribly wrong.