Mine weren't potty trained (pee pad trained) until they were 1.5 years old
I used Postive Praise and Treat Reward (peanut butter chips from the baking isle).
You also have to be consistent, take her outside to "Do Potty" every hour, praise her like you are having a celebration party and immediatly give her a treat for good potty behavior.
You can also use pee pads inside or something like the potty patch inside as well
