She introduces you to people she cares about

Her best friend. Her brother. The coworker she actually trusts. The people in the inner circle — not the acquaintances, not the casual colleagues, but the people who know the real version of her. A woman who is quietly into you doesn't keep you in a side compartment. She starts letting you bump into the people who matter, because she wants to see how you fit and because she wants them to see you. This introduction doesn't have to be formal. It might be as casual as 'oh, you have to meet so-and-so, you'd really get along.' The content is less important than what it signals: she's been talking about you. She's been mentioning your name in conversations where it didn't have to come up. The people she cares about already have an impression of you, and now she's testing the reality against the impression. She's making space for you in the parts of her life she actually values.