She lightly bites her lips while speaking or listening.
She plays with her hair without being aware of it.
She watches you when she believes you are not noticing.
She maintains eye contact longer than usual.
She smiles whenever your eyes meet.
She moves closer to you while you talk.
She finds natural excuses to touch your arm or hand.
She gives you sincere compliments often.
She asks about your relationship status, either directly or subtly.
She laughs at your jokes, even when they are ordinary.