I like you think women are either into someone or not into someone, as if it's an insurmountable wall, you can create attraction based on saying and doing things which will change how women feel about you. Social groups are incredibly powerful to women, women wouldn't wish to be isolated socially at work, they need their support networks - that's probably the case here. It might not be that the girl doesn't like the OP, just that she doesn't wish to risk being bullied/isolated at work by going out with him, this is a situation that can be overcome with the correct words and actions. It was entirely obvious that you've had little experience attracting women because you have no clue what you're talking about. Also she didn't say no when he asked her out, she said she was busy.