Question

Why could Monsieur and Madame loisel have been sent to the prison?​

Answer 1

Answer:

They did have one servant which obviously Mathilde did not appreciate. While Mathilde might have been enjoying her life, instead

Answer 2

Matilda was married to a middle-class man. She did not have the luxuries of life like she imagined herself to be born for. She believed that she deserved better. Her friend was rich and she did not like visiting her friend because it reminded her of all the things she didn't have in life. Hence, she felt envious of them and felt humiliated in their presence.