Hmmm... Makes me wonder if Halloween scared her. I think it's safe to assume that something did.
I would try taking her for walks - long walks, if need be. Perhaps being out and about will get her mind off of her fear enough so that she can potty. You can then lavishly praise and treat her - with yummy things like real meat or cheese, if that's what she likes - that you have brought with you, hidden in your pocket.
Repeat as needed until she makes the connection that pottying outside is a REALLY good thing for her!!!
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