My Mom, Who Is Visiting From Out Of Town, Is

my mom, who is visiting from out of town, is having an allergic reaction. Her cheek and eyes are swelling up. It has been going on for about 5 days. She feels it is a response to kind of plant as she was helping with some gardening. She has been taking Claritin in the morning and benedryl at night for about 4 days. The area is also itchy.