Girl replies this after I text her to meet up with me: "Hey sorry i gave you the wrong impression! But i'm currently seeing someone, thanks for the invite though!"

Is this a shit test or should I take it as she is not interested and next? We first met 3 days ago at a place where I display high SMV, and she seemed very interested and stopped to tell me that she was leaving so I could take her number. She was also with her girl friend who seemed to like me too. Maybe she was using me for attention and to show off to her gf.