hello, It could be. The spraines ankle could lead to fever if it was severe enough as to destroy the structures incolved. Especially if you didn t take care of it after it happened. For example, after the injury of joints the best thing to do is to insert the joint in cold water and then to rap it up with onion and salt in order to suck and remove the fluids causing edema of the joint. If this is not done the fluids coming out because of the injury will be swolled and hurting. The ankle neess to rest as well but you say your daughter continues to move around thereafter. Therefore, after aome days in this conditions with fluid in the joint space the inflamation could occur leading to fever. However this is little probable if the skin is intact (not perdorated or torn out) as microbes dont have an entry point. My asvice: try to treat the ankle with grilled onion mixed with salt and rapping it with a piece of clothing or bandages and give paracetamol to lower the temperature. If the situation does not improve then you have to see a doctor. Best!