How do you respond to a girl who is nice but aloof?

Scenario:

you meet a girl you find very attractive physically

(in a stunning / unconventional way)

she is polite, isn't stuck-up or vain,

but she never really talks about herself,

she seems a bit detached, maybe even solitary.

She doesn't blend in with others around her.

How would you perceive her?

And would you approach her?
How do you respond to a girl who is nice but aloof?
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