When a girl texts first?

A girl that you just met texted you first.

What could this mean?
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She is my friend's friend. I've met her in a bar that is in my building. She had to leave early so I invited her over to see my "exotic birds" collection. She laughed and said that she has to get up early. I walked her home (2 blocks away). 2 Days later she texted me asking me how am I doing and if my exotic birds are still alive. She also wished me a fun Sunday.
When a girl texts first?
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