Girls, you accept the date but avoid giving a phone number?

Why are some of you girls like that? The girl started following me first because she likes how I look, I returned following, and she doesn't follow many people, so not adding any handsome dude. So I started the conversation. She agreed to meet me for a coffee but avoid giving her a number as if I haven't asked that. From my experience, the vast majority of interested girls will give their number with no problem... why is it so hard with some other girls? I mean, obviously, she doesn't think that I'm a maniac cause we have a mutual friend, plus she likes how I look.
Girls, you accept the date but avoid giving a phone number?
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