Kona's nipping

I am dealing with the same issue but with a younger pup. I allow gentle mouthing, something she has learned to do when we snuggle in the mornings or after her middle of the night potty run. And because she is gentle those times, I know that she CAN be gentle but she just hasn't learned self-control. Now, I've added a Time Out to the equation. If she nips hard, I put her in the playpen and leave the room, closing the door behind me. (Her playpen is set up in my computer/craft room where I spend most of my day.) A couple minutes later, I'll go back in and give it another try, again giving her a Time Out if she starts nipping. Sometimes, I'll avoid the nipping by offering her a bully stick to chew on. I hold it with one hand and calmly pet her with the other, telling her what a good girl she is. She will often settle down long enough for us to watch 30-40 minutes of a Netflix together. Because bully sticks are costly and because I think it's important to redirect her chewing when with me, I give her bully sticks only when we are interacting.

My girl is a border collie, also a herding breed. The area where I'm currently having the most difficulty is out potty runs. She wants to nip at my hands, feet, pant legs, nightgown, anything that she can reach from the time I start to put her leash on until I take it off. I've also started using kibble to distract her while I'm attaching and detaching her leash. Then, on our way out, I use kibble to lure her to the lawn. Once on the lawn, I stand super still so she doesn't think my movement is an invitation to nip.