What happens when girls see guys they like?

they get wet panties

They get wet and yes = her clitoris erects.

They get wet and sometimes their nipples get hard. They sit closer to you and wait for you to make a move on them.

girls nipples then erect

The best indication is that the pupils of the eye expand. Girls may have the symptoms of butterflies in the stomach, or weak knees, but you can't observe that. Girls do tend to touch their hair a lot when they're with someone they're attracted to- that's a primal thing of drawing attention to a feature that has attracted men since the caveman days.

If they are sexually aroused, the clitoris/nipples may get swollen.