For severe ear pain, giving aceclofenac + paracetamol can help with temporary relief, but ear drops like Candid should not be used without proper diagnosis, as the treatment depends on whether the cause is fungal, bacterial, wax, or another issue. It is important not to keep using medications on your own, especially if the pain is severe. Your sister should be examined by a doctor (preferably an ENT specialist) to identify the cause and start the correct treatment. Until then, avoid putting anything into the ear, keep it dry, and seek urgent care if there is fever, discharge, swelling, or hearing loss.