What would be the reason?

Girl who didn't end up being interested texted me randomly after a long time out of the blue. I know that could be attention, the thing is is when I met her I could tell she genuinely liked talking to me and asked for my number. I feel the thing is is I just assumed that when it was interest, when I realized after it was probably just in a friendly way (number/contact info isn't always interest). So then it got weird. Could she be texting me after awhile to try to just be friends again? Like I said, when I met her we had a good convo, but just that. Like after we exchanged numbers, a guy came by said he had an instagram, etc. She said I'll follow you. He then asked for her number to text her. She said I don't like giving out my number, you have my instagram you can message me there. So I doubt it's for attention, she wasn't interested, and I know when I met her she liked just casually talking to me. So it could be in a friend way, and since it's been awhile since an awkward misunderstanding, she texted me.

What would be the reason?
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