Hi Luciano,
She is probably not looking at you anymore because you haven’t tried to initiate a conversation with her.
It most likely took a lot for her to ask you what your name was and initiate a conversation with you on Monday after weeks of making eye contact with you.
However, you didn’t follow that up with trying to initiate conversation with her the next day. She may want you to take initiative and talk to her first.
Sometimes, when a guy that a girl likes isn’t doing what she wants when it comes to courting, she may start ignoring the guy out of frustration or to get him to act.
It is probably time that you act.
Try starting a conversation with her the next time that you see her. That could make all the difference.