So Addie has started scratching at the door when she has to go potty! And I didn't do anything.
I really had just given up because no matter what I did, she never scratched at the door. So I just took her out every few hours to see if she had to go. For whatever reason, she started scratching at the door to be let out a few days ago and is still going strong!
Momma is so proud! lol
ETA: Oh, and it only took seven months after I got her (at nine months) for her to be fully potty trained.