Hello. You did not enter the text to which this question refers, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
It is only possible to know the meaning of the character's isolation by reading the text. However, we can consider that the isolation of a character can mean the lack of experiences that this character has, which leaves her with little development and with little knowledge of the world beyond the social bubble her lives in.