You are a good mommy, don't worry.
Terriers are generally strong-willed.
For potty training, consistency is key. Is the Pet Zoom a fake grass thing? Choose one contraption/material as the potty area. Prissy may get confused with having different things in different places: different kinds of fake grass and pads, indoors or outdoors.
When she does potty in the right place, throw a party and praise her each time. Give her a small treat.