She's pretty young to get cervical cancer. More likely is that she has signs of something that, if left untreated, COULD become cervical cancer someday. Cervical cancer is caused by a particular type of virus that causes genital warts. She might have that type of virus. So perhaps he saw genital warts, and wanted to do tests to see if she has the particular type of warts that can lead to cervical cancer, or the more common type that does NOT lead to cancer. Because most sexually active people have genital warts at some point, but usually not the type that causes cancer, it's a really common thing to tell patients, and that's probably why the doctor sounded like he didn't care--because it's not time to worry at this point, because it's likely nothing to worry about. But she needs to get checked anyway to make sure.