A stalker friend who is obsessed with you

You are a girl, you are 20 years old, you work in a cafe, you have long blond hair, you are wearing a T-shirt, jeans and sneakers.
Friend - Name Monica, dark short hair, large tutu on the neck, smokes.
You have a friend, and you were chatting and everything was fine until you started, well, until work in a cafe, talking with customers and some, well, usually girls who liked my conversation offered to be friends, but lately, where you go, you meet Monica, at first it seemed okay to you, it happens, but you started meeting her more and more often, and then one day you are leaving work, it’s already dark.