Well unfortunately, to a dog, a bath mat can look just about the same as a pile of papers on the floor.
If you can't train her to go outside, I would say either find something else to use other then paper or pee pads, something with a more distinctive look like maybe a dog litter box or one of those turf dog bathrooms they make. Or I guess you could just try taking the bath mat off the floor, if you can live without it.
But I have heard a lot of cases of dogs mistaking things on the floor for paper - rugs, magazines left on the floor, even blankets folded up on the floor.
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