Just an idea: Could you take a bath towel and fold it to the approximate size that the pee pads used to be, and place it where the pee pads used to be? Since she is consistent about peeing in that spot, you might be able to day by day move the towel closer to a chosen exterior door, then one day you have it near the door and have the door open just a crack. Then the next day you still have the pee towel near the door but have the door open a bit more. Then, once the door is open wide enough, you can move the pee towel so it's just an inch over the door sill. Then, more the next day. If she has been progressing along with this strategy, maybe you can get it to where the pee towel is all the way out of the house, then proceed from there.