Why going on her mind?

I was in friendship with this girl for like two years. We had gossips off and on but once we talk our conversation become very open and interesting.
Since the lockdown due to Coronvirus. We were talking like hell. From sunrise to sunset we were always connected. One day she asked what do you think about us as couple. I said yeah we get along. We should think about it, what do you think about us? She said i think we are 11/10.
After few weeks i asked her about us. First she kept answering funny but when i said seriously. She said i don't think so. We don't know enough about each other. 😭

Since that day she is acting normal like nothing happened we are talking normally and playing games online too.
But i am still thinking what happened to her that changed her mind.
Why going on her mind?
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