In act 2 of Henrik Ibsen's A Doll's House, it is the nurse (nanny) who sees the box with the fancy dress in it.
Shortly before that, Nora had been terrorized by Krogstad and his blackmail. Therefore, as this scene progresses, keep in mind all the dynamics that are already running on the back of Nora's mind: the fancy ball, the blackmail, Linde's return, her own marriage, and the potential of the blackmail ruining her life.
Therefore, when this poignant dialogue ensues, it is rife with symbolism: Nora is legitimately about to "lose it," and she would very much like to scratch everything and start over again.
Nurse: But it is very much in want of mending.
Nora: I should like to tear it into a hundred thousand pieces!
Nurse: What an idea! It can easily be put in order—just a little patience.
Nora: Yes, I will go and get Mrs. Linde to come and help me with it.
The entire dialogue is a symbol of the state of Nora's life at this point, but to be more specific, it is even more symbolic of Nora and Torvald's relationship.
Their situation is very much "in want of mending." The entire marriage is a charade, a play of sorts, where Nora plays the role of the young, silly, juvenile, entertaining wife. She is the doll in Torvald's doll's house.
Remember that Nora truly believes that her "miracle" would come—that Torvald would completely understand if the truth about Nora's transaction with Krogstad ever came out. In other words, Nora really believes that "with a little patience", her marriage can all be fixed.
To add more irony to the dialogue, notice that she says that she will use Mrs. Linde's help. This is exactly what occurs with her marriage. The pivotal event that beigns the series of events leading to the end of Nora's marriage is the re-entry of Linde in Nora's life.
Linde does help Nora finally break it all apart. Sadly for everyone except Nora and Linde, there will be no mending for this marriage, since "the miracle" never happened for Nora.