Question on potty training a puppy

My female puppy is a little over 3 months old. Potty training is going well. However, I've come to learn that not only is she a little too smart at times, she's also sneaky and stubborn as a cat at times. When I'm around, she won't pee in front of me. But when I leave the house or in asleep, she'll do her business.

I actually leave the backyard door open for her so she can leave and pee outside, so going a long time without being let out isn't the problem. How do I teach her not to pee inside when I'm not around?
 
With my dog I basically took PTO for as long as I could and then it is about taking him outside every 2 hours.
 
We're keeping an eye on our boy and still crate training, but we take him outside every time we get him out of the crate, and whenever he goes by the door, we take him outside. He's doing pretty well, he is 12 weeks old
 
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