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Hello, and thanks for writing in...
Since you have a large breed dog, eating a package of cookies will be unlikely to cause problems, other than possible stomach upset (possibly vomiting or diarrhea over the next 1-2 days), which should take care of itself...
Certainly if she were to show significant digestive problems, she may need to be examined by a veterinarian to get medication to help settle down her digestive tract, so I would watch her for the next 1-2 days for vomiting, diarrhea, lack of appetite, or lethargy, and call your veterinarian if any abnormal symptoms arise.
I hope this helps. Please let me know if I can assist you further.
You're very welcome! Glad to be here to help out!