I have bee sting allergies and it doesn't sound like a bee sting allergy reaction. For me, it's excessive swelling, redness and overall faint feeling. Shock is a major concern with it. Don't quote me though since everyone is different.

Because you said it was redish purple colored it sounds more like a spider bite. Whatever it was I am glad she's going to be OK. I carry a shot kit in case I get stung. Maybe you could ask the doctor to prescribe her one since she is having such a reaction.