If a girl adds you on snapchat randomly, then talks to you in person what does this mean?

Anonymous
So this cute girl from my highschool who i've never had a conversation before with added me on snapchat. Before this, we've only seen each other in the halls and cafe. Then a couple days later we had our grad dance (i graduated highschool) and she came up to me and introduced herself and we had a little conversation, she then said nice talking to you and went to go talk to her other friends. After this we started a streak on snapchat but that's pretty much it. She's really cute and seems like a fun person to be around. My question is does her adding me and then talking to me at the dance mean anything? What should i do?
If a girl adds you on snapchat randomly, then talks to you in person what does this mean?
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