If she has had a fever for four days along with lower abdominal pain that spreads to her thighs or legs, it is important not to ignore these symptoms. This pattern can happen with infections like a urinary tract infection, a viral illness, or sometimes conditions such as appendicitis or a pelvic infection, depending on her age. Pain that spreads and continues with fever means her body is likely dealing with more than just a simple cold. Since these symptoms have lasted several days, she should be checked by a doctor. The doctor may examine her abdomen and might suggest tests like a urine test, blood tests, or a scan if needed to find the cause. Do not give her medicines without knowing the reason. While you wait, make sure she drinks enough fluids, gets plenty of rest, and keep an eye on her temperature. If her pain gets worse, she starts vomiting, has trouble walking, feels burning when passing urine, or develops a very high fever, get medical help right away. Finding out what is wrong early will help her get the right treatment and avoid complications.