For New Julie, there was only one reaction. The same reaction most little girls would have towards jewelry with no one to tell them they couldn't wear it. It was on their dresser after all. Just out there in plain view, practically begging to be tried on.
For now, the changes to her memories were limited to only her, but now that the 'dividing line' had been damaged, anyone she interacted with wouldn't notice their own memories then changing. And reality would eventually have to throw its hands up and say 'you win!'
New Julie didn't even hesitate to put on the paw made bone necklace. Her body for a moment stiffened. Tribal taboos appeared on her back and hip. Her ears became pierced. Rings appeared around her neck and base of her tail. Her dress dissolving and becoming little more than straps to hold tools. Her sneakers becoming paw craft sandals.
New Julie felt dizzy for a moment, then saw nothing wrong with herself as she looked in the hotel mirror. She shrugged and decided to go back to her new friends and her brother.