Hi Yorkie 3,
Izzie is such a lovey. I'm sure with your continued patience she'll come around. Have you considered homeopathy (anxiety) for her barking? It's not a cure all but could provide a calming of sorts while you continue to work with controlling her bark.
It was a marathon with trying to get Gigi (my 1 yr old Yorkie) house trained. It took almost a year. I started with crate training and the piddle pads. I also wanted her to learn to go outside as well. A friend of mine suggested I try the Poochie Bells. They worked like a charm. She took to ringing them almost immediately. Her preference now is outside. She seems to go on the piddle pads only if it's an emergency
Sugarpig