Was she flirting with me?

Dude. She's only 11. She doesn't know what flirting is.

Last weekend my sister invited about 8 of her friends around our place to celebrate her birthday. They decided to watch a movie, and I ended up watching it with them. There was however one seat less than there were people, so one person ended up having to sit on the floor. But everytime somebody got up to get some food or drink or to go to the toilet, their seat would get nicked while they were away. Eventually it was my turn to sit on the floor, which I did, waiting for my opportunity to steal somebody else's seat as everyone else had done.

However when I did so, and the girl whose chair I'd taken came back, rather than having her turn sitting on the floor, she squeezed herself on to the seat next to me. After that she kept tickling me in an apparent attempt to get me to move. When that didn't work she put her legs across mine so she was basically sat on my lap, which prompted some of my sister's other friends to jokingly exclaim "get a room you two!". Anyway, there she stayed for the whole of the rest of the film, sat on my lap, in what was one of the most surreal movie watching experiences I ever had. I should point out that she was basically a stranger to me, I'd only seen her on a couple of other occassions, and then only briefly. So this seemed quite a strange thing to do to me. So I'd like to know whether people think she was flirting with me or whether she simply didn't want to sit on the floor?

tl;dr My sister's friend sat on my lap for the duration of a film at a house party, do you think she was likely flirting with me or not?

Do you seriously even need to ask this?

Pfft.. she's 16, same as me.

Well I'm not the most socially adept, so yeah I guess so. But, to be fair, I'm getting pretty mixed responses in this thread, with people coming to different conclusions, so it can't be all that obvious.

It's not obvious to us because we weren't there. It should be more obvious to you having been there than us sitting reading a paragraph on it - that's why you're getting mixed responses

Why not just test the waters and flirt back?

Whisper in her ear "There's no rain forecasted, but you're gonna be getting wet tonight."

You'll be able whether she's into you or not by her reaction.

Definitely have to use this one day.

I considered it, but because I was so unsure I decided against it. If I had done and it turned out badly it could've been extremely awkward for the rest of the night or might even have spoiled the entire party.

Don't forget to credit me. I haven't been able to find it on the internet, so I'm assuming I've actually made up my own chat-up line.

Well I'm not the most socially adept, so yeah I guess so. But, to be fair, I'm getting pretty mixed responses in this thread, with people coming to different conclusions, so it can't be all that obvious.