If she's from a puppy mill she is most likely used to going potty in a cage. My sister got a westie pup from a pet store (puppy mill) and he was extremely difficult to house train. I could have him outside for hours and he would not go, the second I put him in his crate he'd go in there. I had to take a box (enclosed like a crate) with the bottom cut out and put him out on the grass like that, it was the only way I could get him to go potty outside at all.
I hope you can figure something out with crate training.....12 hours is WAY too long to expect ANY dog to stay in a confined space like that, especially a young puppy.
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