Sounds like she has cairns or scotties. They are most likely not used to her leaving them for long periods of time. You could suggest two options after telling her they bark. 1) Tell her that separation anxiety is very common in terriers and that she should consult with her vet about possibly placing them on medication for anxiety and 2) Tell her she could also try something called Dog Appeasing Pheromones. It sounds like separation anxiety to me.
DAP
more dap, with added info