Potty training a puppy mill rescue

I adopted a 4 year old puppy mill breeder. I am having trouble getting her to potty outside because she will only potty when no one is around.

She will hold it all day and potty in the middle of the night when we are asleep. She is used to pottying where she is laying. So if i crate her overnight, i wake up to a mess and she needs a bath. If i leave her loose overnight she will potty on pee pads.

I take her outside every hour. If i walk away and leave her outside, she sometimes will potty on our porch, but only after I leave the area.

Im not sure how to train her to go in the yard because she wont potty while anyone is around.