Thank you Bonny, Ellie and Elyse.
Progress! We walked at the farm this morning and AGAIN this evening (it is going to pour tomorrow, so I need them tired, lol) then I sat out in the back yard this evening and gave them each a marrow bone. Belle dug in, she enjoyed hers. No idea if she ever had one before or not.
Soon after she lost interest in her bone, and after a short poke about the yard, Belle came over to where I was sitting and put her front paws up on my leg! I was practically holding my breath as I picked her up and sat her on my lap. Initially she kept her front paws on my chest, legs straight. After a good 5 minutes, she turned and settled in my lap. She is so much smaller than the others, she fit FINE! (Willy THINKS he is a lap dog, but he doesn't fit, lol). She stayed quite awhile, though I could feel her shake and shiver now and again. Eventually she jumped down. HUGE step! But all on her terms, in her time.