I disagree. It’s not so binary, and taking the approach I recommend can show that you’re not too eager, more motivated by exploring shared interests and getting to know the person, and, in doing so, thinking about more than your own motivations. She will respond positively to that! And all of these are critical to developing a relationship.

And if she’s interested in more, that’s up to her. While on the social outing, there will be plenty of opportunity for the verbal and non-verbal exploration and expression of further interest, and patience will pay off. “Jumping the gun” by being too aggressive is always a turn-off. It comes off as desperate/insecure and/or sleazy. Nobody likes that.

Edit: grammar/spelling