Definitely try to do something about it now, because it won't just stop and go away. I have an 8 year old Miniature pinscher and he was abused by the people who had him until he was 16 weeks old. We never corrected him with the barking because we figured he was just scared and mentally messed up from the abuse. Now eight years later he still barks at my husband every time he walks into a room or comes home. He doesn't do it to me or the kids, but to everyone else. Even if my DH walks out to the car and back in..barking as he goes out and as he comes in. My husband has been very good to him and has never done anything threatening, but yet he still barks at him. It is so bad that if Twix hears my hubby roll over in bed, he goes off. We try to correct him now, but it only works if it is me doing the correcting, if I am not home and he does it..forget it. I lovwe him and he will stay with me because of that, but if he were anywhere else someone would have taken him to the spca or had him put down...it is that bad.....lol.
Good luck..I am sure if you work with her, she will be just fine. Believe me..you do not want that habit forever!!!!!