I'm confused and worried. Please give me advice?

Dude, no offense, but you're kinda dumb. If a girl out of the blue says the stuff that that girl said to you, she obv likes you. That's why she's giving you one word answers, because she;s mad that you didn't say anything remotely nice back to her. Instead you smiled. Also, the reason why she randomly started saying all that to you is because she just realized she likes you. I hope i helped you, and good luck with her.=)