Girls, what does it mean when a girl does this?

I’m in high school, and I saw a new girl at school, sitting by herself at lunch. I approached her, and we had a conversation for about 10 minutes, then i walked her to class. I got her Snapchat, texted her that day but it was just casual stuff. She deleted my snap today. Did she unfriend me because I didn’t text her enough?
Girls, what does it mean when a girl does this?
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