
I noticed from the photos that you have chain link between you, and dobes are a guarding breed. I would put up a solid barrier, as it is a bit much to expect her not to react to all the stimulus both visual and sound.
I would also be very consistent at making her come in as soon as she barks, and not let her out again until she is quiet. Keep repeating quiet and praise and treat her while she is during his presense.
Do not let her out unattended at all, so that she can't practise the bad habit.
I have a vocal breed, and previously an easily aroused/exciteable shepherding breed, and this worked with both.
The latter had already made a habit of reacting to the neighbour so I put a four foot fence across my garden so she only had access to the first 15 feetby the width, limiting the length she could run along (getting her more excited) and it also meant I could easily go out and grab her and make her come in.
When I got the Elkhounds I kept the partiton fence, though did make the space a bit bigger, as I now have multiple dogs.
This also means that there is a smaller area to poo patrol, and meant the kids when small could chase around without interference from the dog with their friends.
If you don't want to partition then I would put a long line on her that was long enough for you to pick up wherever she was at that moment, so that you can enforce your wishes.
This probelm witll become worse and worse if you don't stop it now with her developing need and enjoyment of guarding and become ingrained habit too.