My crush accepted my friend request in fb. But she didn't reply to my message , what does it means?

Anonymous
My crush knows that i have a feelings on her, some times she will smiles at me if we see face to face , some times she won't look at my face. Any way i send her request and didn't accepted my request. One day i asked her why dont you accept me. She replied she didn't notice ( that was a lie ). But again after one month only she accepted my request. I didn't like any photos or i didn't do anything in her profile. But i just send a message with genuine question ( is that your young sister with you in your profile pic ) . She saw my message but didn't reply. What does it means? . Iam so nervous. ( Its her exam time, her degree exams gonna start after 2 days )
( I enquired about her character she is a straight forward character , didn't fall in love with anyone yet. Won't mingle with boys a lot , its hard to make a relationship with her )
My crush accepted my friend request in fb. But she didn't reply to my message , what does it means?
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