She's essentially a "side girl", and not a main character. You can talk to her when visiting Ashley at school, and go through all of her riddles to get another "final" (thus far) scene with her. Pay attention to the answers to her riddles that are only letters, that will be important later.
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Well, her public urination scene seems to be the last one present in the game thus far. I understand your interest as she seems like she could be a very fun character to interact with further. Did you get the "secret" interaction with her after all of her riddles? It doesn't add a dedicated scene like some of the side girls interactions can.