She could maybe benefit from some group training classes with a solid trainer. Talk to them ahead of time so that they understand what you’re coming in with, but it may do her well to work on some issues in a setting with some distractions. some places offer shy dog workshops that help with anxiety dogs too
My sheltie is a barker too, and can be very up in your business sometimes. When I know I need her to be calmer with our daily activities, I get lots of stimulation for her-use the slow feeder, take a walk, do some agility practice (a great outlet if you have a herder) etc…
