Tip: Make sure that ALL exit-enabled pipes, doors, etc. have a screen exit defined, or they'll take you to Level 0, the "endless" bonus game. Unless Start+Select is enabled, the only way out of it is to reset the game.
Well being touchy feely is a huge sign that she is indeed interested in you. However, you also say that she could have been a bit tipsy, so that may have made her be a bit more touchy feely than usual(I don't really have experiences with alcohol).
Your situation isn't really super predictable with the information you gave, but from personal experience, getting in physical contact with you, especially in such a way as yours she seems interested.
Similar thing that happened? Well, we are both 16, so I know she wasn't drunk when she did it, but she did some physical contact, but I acted cool like you did, and not take it too seriously. Then when we were chatting and talking about stuff she mentioned "You are more oblivious than you know" and I asked her, "what?" and she replied, "nevermind". Long story short, we're going out now.
If you are interested, try and talk to her casually, then try and get some information out of you to confirm that she likes you. That's when you can respond how you see fit.