Can head lice cause hives on a 5 year old girl?

Not sure. Lice cause itching and irritation though I have not seen associated hives. Hives are a hypersensitivity reaction to various causes including bug bites, medicine, allergens, stresses both physical and emotional. As long as hives are not associated wtih difficulty breathing, tongue swelling or difficulty swallowing, they are not emergency and resolve within 24 hrs typically.
Hives. Have not heard of this happening before but I can not give you a definitive answer. Stress can also cause hives. Allergic reactions, chemicals in foods, insect stings, sunlight exposure, food, infections, systemic disease or medicines can all cause histamine release, hives. Sometimes it's impossible to find out exactly why hives have formed.

Related Questions

If you put a cat or dog flea collar on a girl's ponytail, is that an effective way to kill head lice?

No! Flea collars are designed to kill parasites that infest cats & dogs, not human head lice. Not only would it not work, but there is some evidence that the chemicals in flea collars might be toxic to children, particularly young ones. There are several effective fda-approved treatments for head lice; stick with those.