L.B.
We live with several dachshunds. All are pee pad trained. We learned that the pet pee pad were too small for them and often missed. We buy the human bed liners from Rite Aid - they are about 20x36 inches- no more misses.
She sounds like a good dog, especially since she is trying to lessen the mess she leaves in the house. Try a larger pee pad, and put a litter box next to it.
I don't know that my dogs would use a box - but, my cats have all been known to the pee pads.
Good Luck
God Bless