If a girl brushes onto you when there is plenty of space?

Why would a girl do that? For example I was pointing out a car to a girl asking her if it was hers, and she was standing next to me. So when I pointed out the car and started talking she leaned in closer and brushed her arm on mine and looked where I was looking, even though she could obviously have just looked from where she was standing.

This same girl bumped into me when I was talking to someone else, her back bumped into my back and she stayed there for a few seconds before I moved away, our bodies were just touching even though there was plenty of space. I mean she was like opening a drawer or something but there was plenty of space and no reason to graze up on me like that, even though there was technically a reason for her to be behind me like that.

Do girls flirt like this, do they want my attention or just want to find a reason to feel me up or is she just not aware of the space she's taking up?
If a girl brushes onto you when there is plenty of space?
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