Why didn’t she add me back on Snapchat?

Anonymous
So there’s this girl I really have a crush on, and whenever we talk (or I would say most of the times, but I’m not sure) she smiles when I talk, and we have a lot of eye contact in class. However I think that she knows I like her, because her friend told her, and we haven’t talked in a few weeks but most of the times we do talk, as I said, she’s kind of red in the face and smiles when we do something funny. But the problem her is, a couple months ago I added her on Snapchat but she hasn’t added me back or maybe she removed me. Whenever I try to message her it says “your chat will be pending until (person) adds you back”. I’m confused as it says she hasn’t added me back yet, but the internet says she might have deleted me. Help?
Why didn’t she add me back on Snapchat?
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