To see if the lady likes you.
1st is to look at the person
If she is looking right at you, she is into you. If a person likes someone, they cannot take their eyes off the person.
What is she doing with herself, if she is grooming a lot then she is insecure.
Turning a shoulder at you, as part of turning away to look away from you, means she is ‘giving you the cold shoulder’.
If she is leaning back and you are doing all the work, it means she is not into you. If she likes you, she will be engaged and leaning into you.
Look at her feet, if her toes are pointing into your direction she is into you.