It is always difficult as a parent when a child is injured. There are many challenges to deal with including those dealing with medical treatment, medical bills, insurance, and, yes, a potential legal case or claim. In most instances, a case has four basic elements: 1. Duty; 2. Breach of Duty; 3. Causation; and 4. Damages. You wrote that your daughter suffered a head injury. That would be the element of damages. The other three elements must be proved as well. The department store had a duty to provide a reasonably safe environment for shoppers. You must prove on the case that the department store breached this duty which, in turn, caused the injuries. While it is unfortunate that your child suffered an injury on the premises of the store, that typically is not enough by itself to pursue a case. Because these matters can be complex and confusing, contact a personal injury attorney for a free consultation. Good luck with your case.