According to the stage directions, Mia's character seemed to be that she doesn't want to hurt Laura's feelings.
A stage is a place where a play or an act has been performed by various artists.
The character of Mia as analyzed from the provided scenario is perceived to be protective and generous towards the efforts made by Laura in cooking the stew for her which is actually in a bad taste. Instead of disrespecting the food, she ate it for her happiness.
Therefore, Mia falsified that the food is good and give a plus grade to it just to not hurt her feelings.
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