To what extent are the other characters in A Doll's House responsible for Nora's downfall?

I think we can safely conclude that the other characters
of this excellent play, in particular Krogstad and Mrs. Linde, are most definitely
responsible for Nora's downfall. It is clear in Act Three of this realist drama that
things are catching up with Nora. Krogstad is threatening to reveal the truth about her
spending habits fo Helmer, and there appears to be no escape. However, Mrs. Linde does
have the ability to stop Krogstad from sending the letter, but she believes that Helmer
should know the truth about Nora and her actions. Note what she says to
Krogstad:

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Helmer must know the truth. This unhappy secret
of Nora's must be revealed. They must come to a full understanding. There must be an end
of all these shiftings and
evasions.

Mrs. Linde clearly
feels that the artificiality and deceit of the relationship of Helmer and Nora must come
to an end, and she sees Krogstad's letter as an excellent way of bringing things to a
head and forcing Nora to grow up and mature. Clearly, therefore, Nora's downfall, if you
choose to call it that, can be said to be the responsibility of other characters who are
choosing to act in a way that they thing will help Nora.