What should I do about this Girl? (short question)?

[328]

Im 18, I messaged this girl on FB yesterday and we talked for a while then all of a sudden she didn't respond back. Facebook said she saw my message. I know this girl likes me because she told my brother ( my brother works with her) and she is too she to tell me). What does this mean that she is not responding back and what should I do.

Thanks!

[Zach Y]

give it a rest sometimes silence brings em runnin back

[GINGER]

euugh she could have been busy but when it loads her chat was open and thn she turned it off your just over thinking...

[me]

She probably had to leave to do something because if she likes you she wouldn't just stop the conversation like that. She will probably want to talk again later.