Don’t overthink this, take it for what it is, a hit/minor IOI (indicator of interest). The very bottom rung of the escalation ladder maybe?
Women telegraph their interest in all sorts of nonverbal ways, from light touches, strokes, squeezes, eye contact, hair flipping, neck/chest flushing, smiles, pushing against you etc and then others are naturally touchy-feely and it means nothing at all but if she’s not been like this before, that is something to note. It is then up to you to pick-up on them, and escalate back in a similar nonverbal way if you want to and of course if the situation allows. Only then will you find out her real level of interest and how far she will let it go.