Max does not like going near a pad that has poopies on it. Both of my boys want it picked up right away.
Try disposing of it right away and giving Gidget a fresh pad. See if that makes a difference. Are you usually home with her during the day, or are you gone for work? If she is alone, I see where that would make things more complicated.
How many times a day does she poop? Is it about the same time each day? My boys are pretty much on a schedule, twice a day. Teddy does his first one right after breakfast. Max may take a little longer.
They both usually save their evening poop for our evening walk.
Walks usually stimulate the need to do poopies and can help regulate timing if done consistently, about the same time each day.
When she gets it right, pee or poop, be sure to praise profusely and give her a little treat reward. My boys are 7 years old and they still love their praise and rewards. They know how to milk the system, maximize their potty rewards.