Hives Support Group
Hives is a relatively common form of allergic reaction that causes raised red skin welts. These welts can range in diameter from 5 mm (0.2 inches) or more, itch severely, and often have a pale border. Urticaria is generally caused by direct contact with an allergenic substance, or an immune response to food or some other allergen. Hives can also be caused by stress.
As for the energy drinks I don't know if they are causing them or not but my Dr told me that if I suspect something to just stop it for 2 weeks if the hives don't go away in two weeks it isn't whats causing the hives.
If her hive are caused form stress I would do all I can to prevent her stress. Ask her if anything is bothering her on a daily basis and try to remove anything that is causing stress to her if possible. Good Luck with your mom.