As a teenager, Pearl attended the Louisiana Normal School, a college for teachers in her hometown of Natchitoches. According to the back of the photograph, she is in the very center of the bottom row. So here is Pearl, about 18 or 19 years old:
She and many of the other girls in the photo are wearing what look like sailor-style dresses and similar hair-do's. Pearl herself is sporting a pretty pair of white shoes with black buckles. I can't help but notice how much she looks like her mother!
If you know who this may be, let us know in the comments!