A lot of dogs, even those used to being left, can become anxious when they are alone in a new home. Try to introduce her to being left gradually; first for a minute or two, and then the odd half hour - waiting til she is quiet to come back and not making a big fuss of her when you greet her
It took Bonnee two weeks to settle in with us and relax when she was left alone for short periods even though she had bee nelft daily for 5-6 hours in her former home (which imo, is too long for any dog). It took longer still before she was happy to be left without the security of a crate
she has now started to bark when we leave the house and this can go on for hours at a time.
How long are you leaving her for? Even dogs which are used to being left are rarely happy being left "for hours"