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If her loneliness is essential to the story, I don't see this as being a problem. You don't need to add a huge cast of well-rounded characters just to have them. In fact, I think that this might en...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/41556 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If her loneliness is essential to the story, I don't see this as being a problem. You don't need to add a huge cast of well-rounded characters just to have them. In fact, I think that this might end up serving your story quite well, as long as it's executed well. If it's made clear, somehow, that the main character is isolating herself, or somehow that her perceptions of the characters around her are one-dimensional, I think it would absolutely end up improving your story.