It proves have was not lying as she was accused of over and over here.
Oh, but she did. She described the dude at first as a dark complexioned and black haired, you can read it in the transcriptions of her official statements. Then she fingered Murat (as the police did not exactly found the man that was allegedly walking his child on that street in the right time, we don't know how did he look). Whoever was walking there could not have black hair and dark skin and, in the same time, look like Murat. So Jane Tanner lied.