She can physically only refer to other people in 1st person. For example: When she wants to say "Thank you!", she blurts out "Thank me!" or, when she tries to say "Nice to meet you!", she blurts out "Nice to meet myself!" It is physically impossible for her to say any other pronouns that aren't in the first person, for reasons unknown even to her. Even if she tries very hard, a 1st person pronoun comes out of her mouth, and she gets bullied for it.