The entourage tries to make the person eat.
He will try verbally by saying, "eat, eat....go ahead, eat something". We do things differently; we radically alter the diet by encouraging the person to eat very little of certain selected types of food. The least anxiety-provoking thing is to make a very small transgression.
As if it were a question of tasting a minimum quantity of something that the patient has forbidden herself for a long time: a small biscuit, a small piece of pizza, a ship...And the patient will not feel this as dangerous because this action does not endanger his balance. Of course, as the therapy proceeds, the amount will increase.
The family will be able to observe these small changes, which is important, especially if it is a minor. And practice the conjuration of silence to stop the attempt at a solution so that the girl takes responsibility for her problem on her shoulders.