Don't let her rub her face when the halti is on, she may scratch her nose on the ground. Make her wear it in the house & feed her treats & play with her to keep her mind off it... it will take a while for her to get use to it, but the rubbing will more then likely never stop. Max is 9 & when I let him off leash, I keep the Halti on & at some point her will rool in the grass & rub his face.

Do the same thing with the seat belt. make her wear it in the house. She needs to get use to the harness first, then go in the backseat with her.