Visit a Pediatric Dentist for your kid's treatment. Cavities need fillings. If any teeth has got infection into roots, then pulpectomy procedure can be done to save the tooth till it falls off. A full mouth xray or OpG should be taken. Regular brushing with fluoride containing toothpastes should be done. Other than these, any malalignment of teeth can be treated with Orthodontic braces only after all her permanent teeth come out when she will be 12-13 yrs old.