Mrs. Linde believes she will return with Krogstad, because there was a time when Krogstad would do anything for her, so she believes that in the name of the old days, Krogstad will return with her if she asks. This can be seen in the text at the moment when Nora asks Mrs. Linde not to meet Krogstad because he can hurt her, but Mrs. Linda tells the girl not to worry because there was a time when Krogstad would do anything for her.
Try re-reading the text and find evidence on why you think your answer is right even if it takes and hour you will benefit from trying harder than ever and if you ever have to do this again you will be able to do it by your self
