Hives Again...

so we have hives AGAIN.. her chest area again.. red hives. she is itching again like crazy, but its mostly at night she itches before she goes to bed,then she wakes up in the middle of the night and itches again.. dont know why, the only thing i can think of is i gave her a spoonful of ground beef w/ chicken necks to put her pills in , with a chicken leg, so i am thinking she is maybe allergic to beef... she is chewing her legs more too. uggh... she has had just chicken for the past week, and the itching has subsided a tad, not much, but a little, now we have hives again.. it could be the beef, or maybe my laundry detergent.. she has been on plain chicken for a week now, no hives, but with the spoonful of beef she has hives again ..