Never greet a Chinese woman as xiáo jiě (小姐). It is literally miss, but implies prostitute.
The most fashionable way to greet a Chinese woman is: měi méi (often written as MM, literally pretty).
A flattering way to address a woman is: méi nǚ (美女, literally pretty woman).
A polite way to address an elder woman is: nǚ shì (女士, literally lady), which can be combined with her family name, for example lǐ nǚ shì.
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Everyday Chinese Expressions (Mandarin) 