Cold approach experience

Today while I was on my bicycle I saw this girl, she smiled at me, I immediately biked back and talked with her said she had a nice smile and asked where she was going. She was heading towards this mall, I asked if I could come with her. In the beginning it was good, but she became nervous and weird. Saw her hands shaking, I was super chilled. In the middle of mall she hinted me to leave her alone. I said, oh no problem I will once you are done shopping in my mind thinking I ain't leaving just yet bitch lol. I was still chill, outside she was like well maybe I will see you around some day and I said well rather not she was a little offended, and I am like you look like you saw a ghost or something. Didn't give number either. So I went on home.