I gave you the information you needed to the best of my knowledge and ability. But you should consider what I said about if it was your arm, or your brothers. When we accept the responsibility of a pet we are taking their lives into our hands. Morally, and LEGALLY, we have a responsibility to provide proper care for them , in sickness and in health.
Most regulars on this forum are here because they love and care about geckos. It is understandable they would be shocked, upset and appalled to hear that a gecko may have a broken back, or broken legs, and has not been rushed to a vet. Imagine how people would react on a "New Mothers" forum if someone wrote and said "I dropped my baby on floor, and now her legs don't work. What should I do?" I am not saying that I think that human lives are equivalent to a geckos, but leopard geckos are living, feeling, intelligent creatures...and they deserve to be treated with care and compassion. When we raise them out of the wild, and take them into our care, we owe them that...not only as living creatures, but for what our treatment of them says about us as human beings.
I think the answer to your question, "take her to a vet", which was given to you by everyone, should have been obvious. I hope you will advise your brother to do the right thing.