Answer:
The theory of self-perception
Step-by-step explanation:
The theory of self-perception refers to the situation in which the individual changes his attitude towards himself in relation to the attitudes and conclusions that other people have about him, or that he thinks that other people have about him.
That is, in this theory, individuals talk about other people's perception of him and the personality he has. An example of this can be seen in the question above, where because of a grammatical error, Isabelle believes that people are having conclusions about her being stupid and this is affecting Isabelle's perception of herself.