What should I do with her?

Last year I liked a girl that was in the same class, I noticed that she was traveling in the same train I travel everyday, so I decided to approach and have a conversation about that, she was so kind, she gave me good vibes, I asi her instagram, she followed me back. I waited one week to text her, sent a dm but she didn’t answer so I just thought it was over and unfollowed her. I told the situation to a friend of mine and she told me that it was because I waited one week, and she told me that I should follow her again and try to fix everything, I follow her again and she followed me back again, I sent a dm, this time she answered, we have a small talk, nothing important, the next time I saw her in class I decided to ask her out, I kinda messed up because I was nervous, she told me that she would think about it. I gave up on her and continue my life. Last week I found that she is in the same class I am, I really like her, she has something else, his personality is unique, what should I do? Should I ignore her, approach her? Pd: she still follows me, we are in our second year of uni.