Answer:
Borrowing a fancy necklace is important to Matilda because It will help her blend into the crowd.
Step-by-step explanation:
Matilda Loisel craves so badly for attention and luxury, she wants to be part of high society and she wants to be part of the group with all those beautiful and elegant people, therefore wearing the jewelry will help her accomplish her goal and blend in, as she arrived at the party she got the attention of every man in the room, as she supposed it would be if she wore the necklace.