Is this a sign that she likes me?

I know i'm gonna get a lot of "oh my god you're so stupid" comments. Well guess what! I'm not good with street smarts so please help!

While i was walking and minding my own business, this girl randomly says hi to me. I don't know her, and it was out of the blue. So I say hi to her and decide to talk to her. Her friend (who was sitting right beside her) really seemed to take an interest in me and kept asking me all these questions. Then after a few dialogues, the girl herself asks me random questions. What I'm trying to say is that both of them seemed to really be curious about me. While the girl talked to me, she was really fidgety and laughed easily. She also looked like she was about to pee lol. When I left, I overheard her laughing hysterically when she thought I couldn't hear her anymore. Is this a good sign?

She's also British, if that helps in anyway lol.