What Could Cause Sudden Swelling And Hive Breakout, Tried Reactine And Benadryl?

Hello, My daughter has been having extreme outbreaks of what looks like hives all on her arms, legs and between her knees and especially between her upper thighs. This has been happening for 3 weeks now. Yesterday, she woke up with a swollen face and her lips were 3 times the size that they usually are. She was taking Reactine and Benadryl to reveal the pain. She went to the emergency and they gave her and epi-pen injection and prednisone pill. She again woke up this morning in extreme pain from itchiness. She took the inhaler they prescribed but the itchiness did not go away until she took the reactine. She is now also on prednisone - 1 pill daily for 4 days. She will not be tested for any allergies for 6 months. We have thought of everything but nothing has changed in her usual day to day doings. Oh, she just joined a gym - since December - 10 weeks now. She was out with some friends to a burrito restaurant and while she was eating, her lips immediately began to swollen. The hives she has are many and large and raised. What is this?