How to ask a shy girl for her phone number without having her suspect anything?

Anonymous
There's a girl in my school who's phone number I want to get. I think she wants to befriend me because she has been saying hi to me several times a week for the last couple of weeks and I think her "hi" has a meaning because this very-kind girl HARDLY ever talks or even says hi to people who aren't her friends; ESPECIALLY with guys (me being a guy and not her friend, I believe she at least wants to befriend me). I have asked many questions about her in the past anonymously on this site and the majority of the people (more than 3/4 of the people) say that this girl say a crush on me thus increasing my desire to get her number as I like her too. so how do you think I should get her number without having her suspect anything ?(if there's an easier way than asking her directly I would appreciate it because I am VERY SHY) thank you in advance
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+1 y
by the way do you think I should ask for her number? I'm not sure about if she would give it to me if I asked. If you want to know abouth her behavior then follow these links.

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sorry, couldn't put links on
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if you want to see one of the questions, go on google and type this: girlsaskguys kind gal spontaneous. choose the first one (it should say "Girls ask guys - Widgets) and the text underneath should say: There’s very kind (she is kind to everybody) gal.
How to ask a shy girl for her phone number without having her suspect anything?
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