Most of them probably don't even notice it.
They may also not be an indication of her feelings and could be a sign of something else.
There are several variants: 1.
She could subconsciously lick her lips or stroke her neck when approaching or passing you.
An in-person or online therapist can help you learn how to mostly correctly interpret female body language and teach you how to have more open and constructive conversations with your partner or spouse.
These are not things that people do when they are just friends with someone.