What does it mean if a girl randomly says hi to you?

LuigiFan7777777
So, this random girl that I don't know tends to say hi to me every time she sees me, not that I have an issue with that by the way. However, the reason why I am looking a bit in to this is because she only says hi to me, and no one else. Sometimes I have noticed she even blushes, or when she's with her friends, they giggle. I haven't had much girlfriends so I am not good at picking up signs but I think this could mean something. But just to be sure, I wanted to ask all of you to see who could help me because I honestly don't know what this could mean. She could just be a friendly person, but I just find it interesting how she only says hi to me, even when I have a group of friends around, she still only says hi to me. So, what does it mean?
What does it mean if a girl randomly says hi to you?
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