Is this girl crazy???

last year I had a girlfriend that I really believed loved me, she called me all the time, cried when I got mad and she even bought me a $100 necklace, but she fooled me for a while that she had triplets, and pretended her "sisters" went out with my bother and cousin but I never seen them at once and whenever I wanted to see them they were never around, I was young so I fell for it but after a while my brother brought it to my attention that maybe she was playing us and everytime I would confront her about it she would get really sad and blow on me because I was calling her a lier. Was something wrong with her?