She's into you. I'm not sure how old you are so this be not be the most appropriate choice of action, but keep bringing up the dirty stuff because that stuff contains lots of conversations. I think you've maxed out on everything you can do on Graal with her, so I recommend going to snapchat. If you both get a snapchat, she can send you a picture of her face and you can call her pretty, which is exactly how I pulled the pretty girl in my profile picture. However, if you decide to stay on Graal I recommend to continue what you're doing, she's not friend zoning you because she would not be talking about her period and stuff unless she's extremely outgoing.

Ask her risky questions because then she gives risky answers; have you ever had a boyfriend?; Yeah? Tell me about him. If she's calling herself ugly then she has never had someone call her beautiful before so continue doing that, it will show that you like her. Drop some hints soon or else you're gonna be a friend.