What does it mean when a girl suddenly starts to get playful with you?

Greateye

Do girls wrap around one of her arms with a guys arm out of nowhere?(When they've barely know each other).

Would people barely knowing each other like this from the start?

I'm looking for some papers and suddenly this girl came to the seat and took it saying in a playful tone:"You were gonna sit but I took it"

So I played along (playfully) and moved the chair with her on it (but I returned her back to her position, she laughed a little bit).

Context:

I've barely known this girl, for like 6 months (we talked little as it's rare to see her). One time she was checking for something on the hallway, there was no one in the hallway. She walked on that same hallway but when she gets past me, she turns her head around and she seemed to be looking at me from the corner of her eye. Another time I was looking for a clipboard, I found one but it was stuck on a drawer. The same girl came to assist me (the drawer was kind of stuck). We grab the edges of the drawer and suddenly she wraps one of her arms around my arm (I have no idea why because she had some space enough for her). There was another time where I helped her organize some things that her coworkers had kind of struggled to do (because they were busy), she caught me while organizing and she seemed happy just for me to do that.

What does it mean when a girl suddenly starts to get playful with you?
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