The author says that Louisa Mebbin had a protective elder sister attitude towards money because she would go to any lengths to earn extra money and protect the money earned in such a way that she could not lose it . That is why she blackmailed Mrs Packletide to give her enough money to buy a cottage of her liking .

Introduction:
Louisa Mebbin, a character from the short story "The Mark of Vishnu" by Khushwant Singh, is known to have adopted a protective elder sister attitude towards money. This means that she was very cautious with her money and was careful in managing it.

Reasons for her Protective Attitude towards Money:
There are several reasons why Louisa Mebbin adopted a protective elder sister attitude towards money. These include:
- Her upbringing: Louisa was raised in a family that did not have a lot of money. She learned the value of money from an early age and was taught to be careful with it.
- Her experience: Louisa had experienced financial difficulties in the past. She had been in situations where she did not have enough money to support herself and had to rely on others for help. This had made her more determined to be careful with her money.
- Her personality: Louisa was naturally cautious and practical. She was not someone who liked to take risks and was always thinking ahead. This made her a good manager of money.

Examples of her Protective Attitude towards Money:
There are several examples in "The Mark of Vishnu" that demonstrate Louisa's protective attitude towards money. These include:
- Her reluctance to lend money: When her brother-in-law, Nathu, asks to borrow money from her, Louisa is hesitant. She knows that Nathu has a history of not paying back his debts and is worried that she will not get her money back.
- Her insistence on being paid upfront: When she agrees to work with Nathu and his wife, she insists on being paid upfront. She knows that Nathu is not reliable and wants to make sure that she is not left out of pocket.
- Her concern about the family's finances: Throughout the story, Louisa is concerned about the family's finances. She knows that they are struggling and wants to make sure that they are not wasting money on unnecessary things.

Conclusion:
In conclusion, Louisa Mebbin adopted a protective elder sister attitude towards money because of her upbringing, experience, and personality. She was cautious and practical in managing her money and was always thinking ahead. This made her a good role model for others and helped her to avoid financial difficulties.