Why does a girl blush when she sees me?

A blush on its own tells you she noticed you, and that her body reacted. It does not tell you whether the reaction is attraction, nerves, embarrassment, or the feeling of being looked at across a room. The better signal is what she does in the thirty seconds after. Does she stay in the conversation, does she look back at you, does she bring you into what she's doing, or does she drift off to someone else. A girl who blushes and then keeps finding reasons to be near you is showing interest in a way the colour alone can't. A girl who blushes and turns away fast may simply be flustered, and wants the moment to pass without drawing more attention to it.

Pay attention to context too. If the blush happens in front of friends, some of it may be her not wanting to look interested in front of them. If it happens when you're alone, that's a stronger clue. Either way, the blush is a reason to talk to her, not proof of how she feels about you.

When you reach out after seeing her, the goal is to make it easy for her to answer without having to name what happened. Two kinds of message tend to work. The first is a light callback to the moment you actually shared, like the event, a joke, or something she said, which lets her respond on the topic rather than on herself. The second is a simple, specific invitation to do one thing together, such as a coffee or a walk, where the plan carries the weight. What both kinds share is that they don't mention the blush, don't ask whether she likes you, and don't pile on compliments. A draft is on track if she could answer it in one line and still feel comfortable. It has gone off track if it asks her to explain herself, or if it reads like a summary of how you feel about her.

If you've just met her in person, send the first message the same day or the next morning while the context is still fresh. Waiting a week makes the connection feel like a cold text from a stranger. Keep it short enough that she doesn't feel she owes you a long answer. If she replies warmly, match her energy and suggest a specific plan within the next message or two. If she replies with a short answer, don't read it as a sign to panic or send more. Wait two or three days before following up, and make the second message a different topic or a small plan, not a restatement of the first. If there's still nothing after one more try, stop. Silence after two attempts is an answer, and continuing will only make the interaction feel awkward for both of you.