"I'm not really looking for anything right now."

What she's actually testing

Whether this will create urgency in you. The scarcity-calibrated man hears a window closing and campaigns to be the exception. He tries to change her mind — which confirms that the sentence worked exactly as designed.

Why it works on most men

It triggers the need to qualify yourself as different from the general pool she's not 'looking for.' The man in scarcity interprets every stated unavailability as a problem to solve. He's the salaried worker trying to convince the millionaire his stock is worth buying.

The response framework

The obvious: 'Noted.' Keep talking. The disruptive: you weren't necessarily 'looking for something' either — that's the frame she's assuming you're in. The man who genuinely wants, not needs, doesn't hear a closing window — he hears a neutral statement that has no bearing on the quality of the current conversation. If the conversation is interesting, it continues. If she's actually interested despite what she said, that will become clear through behavior, not words. Words are cheap. You read behavior.