Could use advice(nothing to do with WH)

Sorry for the long read but I wanted the situation thoroughly explained.

First of all, I am coming here because I was hoping someone might have an idea of whether or not this girl likes me. First of all, I know her because she is my best friend's sister.

I've known this friend for about 2 years and didn't get any idea that his sister might like me until about 2 months ago. I was thinking she liked me because she seemed to try to talk to me and would come close to me sometimes. One time is when my friend was on the computer she came and sat on the arm of my chair. A second thing that happened was I slept over at my friends house and I was sleeping on the couch and for one reason or another she was trying to wake me and my other friend up. The thing is though that she was paying more attention to me, this included her sitting on my legs(near the knees), which might sound kind of strange but she basically sat on me to wake me up. A third time was when me and my 2 friends were sitting down watching TV and she pulled on my belt to annoy me. Also, she does mess with a lot of people not just me but it seems like she was giving me extra attention.

Next, the day before I went out of town for a week, on the internet she asked what I would say if she said she liked me. Avoiding the question at the time I asked why she annoyed me all the time if she liked me. (Now this part I don't remember exactly because it was 2 months ago) She said something like what do you want me to say? your hot? Next, since I still was avoiding the question at the time because I was unsure of what to say I just started joking around with her about it. Nothing that important really happened after this, I talked to her for a little bit thats all, not talking about that. One of the main reasons we switched subjects was I was talking to my other friend asking him if he thought she was serious or just joking.

Now this is the part that basically made it impossible to know if she was serious or just messing with me because I'm her brothers friend. My friend started talking to her about it which I assumed embarrased her. And if she was serious that would embarass her because he is also really good friends with her brother.

After all of this it seems like she likes me probably to you and to me at this point. But, everything was different after this.

2 months have gone by and she hasn't shown ANY interest in me at all now. I was over at my friends house watching a movie and she sat on the other couch. Also, she hasn't shown any insentive to talk to me, not when I was over there nor online.

So today I was curious if she did like me or not so I said to her online that I was curious if she liked me or not, because of that one time, and I told her if she did like me she could tell me and I wouldn't tell anyone if she didn't want me to. After I said this she said I can't like you, your *myname*. So I said I was just wondering because u acted like you did that one time and you asked me what I'd say if you said you liked me. She said it was a joke and that I'm completely clueless. And thats all.

To sum it all up, originally she acted like she liked me but now she claims it was a joke.

Now other things I'd like you all to note is that:
-I am unsure if I like her or not, I am mainly curious as to if she likes me then I'll consider whether I like her or not.
-She is 2 yrs younger than me so next year when I'm a junior in HS she'll be a freshman.
-I don't know if it would ever work anyways because she is my best friends sister.

So I'd love to hear anyone's opinion on whether or not they think she likes me, and if so then whether or not you think a relationship should ever occur between us or if a relationship would even have a chance of working. Also, anyone have any suggestions for what I should do (I considered asking her what she'd say if I said I liked her, like she said to me, but she already denied that she ever liked me so I don't know)

IF ANYONE TOOK THE TIME TO READ ALL THAT THEN I GREATLY APPRECIATE IT. ANY HELP IS ALSO GREATLY APPRECIATED!

Thanks.