Marta is a very wild teenager. Shane's mom doesn't want Shane to run around with Marta because she is worried Marta will make Shane want to break the rules at home, just as Marta does at her home. Shane's mom is worried about the bad apple effect.

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The passage states that Shane's mom is worried that Marta will make Shane want to break the rules at home, indicating concern about the bad apple effect - the idea that being around someone who behaves badly can influence others to behave similarly.

Marta Is a Very Wild Teenager