She stops sending the photo to three friends before she leaves the house. The dress is on, the bag is on her shoulder, and she is already late enough that nobody gets a vote.
That is usually when people notice. Not because she is louder. She just quits checking the room like it is a panel of judges. At dinner, she orders first. If someone compliments her, she lets the words land instead of batting them away with some joke about Spanx or bad lighting.
Men catch that shift fast. The chase starts when attention no longer looks like something she is waiting around to receive.