Is it okay to call a girl I know who is in a relationship miss?

I call a girl I know miss. I message her things like "what are you doing today, miss?" I don't want to make things too uncomfortable. Since I know her, and I have known her in person for a long time. Reason I ask is because she doesn't always answer me. I just like calling her miss but I hope I... show more I call a girl I know miss. I message her things like "what are you doing today, miss?" I don't want to make things too uncomfortable. Since I know her, and I have known her in person for a long time. Reason I ask is because she doesn't always answer me. I just like calling her miss but I hope I am not doing something wrong. She has a bf but I don't hit on her. I just like messaging her and hoping to hangout with her.
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