I’ve done what 1 said a time or two, try to feel out the vibe when you see her tonight. If she dressed up at all a casual compliment could kickstart some flirting if that is her intention. Tell her you like her makeup/clothes but don’t stare at her, it can come across as leering and creepy if she isn’t actually interested and you’ll hang less in the future. I wouldn’t flirt with her all night but some here and there while acting as u normally do. It might not start as a date but could end as one