She added me on Facebook but doesn't reply at all

Anonymous
A girl I met when I was 15 1/2 and went on a date on with added me on Facebook but every time I try chatting her up, she doesn't reply. It always says "seen" so she's definitely seeing the messages. I'm not into her but I do have a couple questions I'd like to ask her, one of them being why did she add me (we have a history). She sent me the request and I accepted so it's not like she wasn't trying to reach out but I just can't seem to get her to answer at all. I'm 24 years old now, by the way. I have a couple questions

1. Girls, have you ever added a guy and then just not talked to him at all? Explain why you did this.

2. Guys, have you ever had a girl add you and then not talk to you at all?

3. Should I delete her?

She added me on Facebook but doesn't reply at all
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