What does it mean if a girl doesn't give me her number despite giving me hints she was interested?

So I met this girl at a party and she was there selling food with her friends for their association. She was giving me those eyes and always smilling when talking to me... also laughing etc. She seemed comfortable talking to me and I shot my shot but she said she couldn't give her number bc she was working (still smilled)

Maybe i asked too soon and didn't make enough of a connection for her to feel comfortable but what if i see her on campus and this time she's not working? Should i talk to her? Ask her again?

Updates
7 mo
note: there was also eye contact when i was talking to another girl
What does it mean if a girl doesn't give me her number despite giving me hints she was interested?
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