1) don't apologize for being sexual in your interest. Mindset is, "Of course I'm interested in you sexually. I wouldn't waste my time if I wasn't. If you don't feel that way, I'll easily find another who is." Mindset . Not Expressed but MINDSET. Your actions will reflect that.
2) initiate kino in a non sexual way before accidentally venturing into more suggestive territory (tons of articles out there)
3) apply eye contact when out of touch range
4) Reward her sexual intent with attention.
5) welcome her expressing degrees of physical desire. Work up slowly....
6) if she pulls back then you pull back as if you meant to all along. Let your attention wander to something else around. She might be trying to make you chase and will try to reel you back in. reward that with your intention.
You can do all this without a word or inappropriate touch in public. You are ramping up the sexual tension.