Few things. Dogs are like people with different personalities as well as different places in the pack. Some of what the GS is doing is just stay away from MY stuff. Some is dominance issues most likely but I'm not there to see which dog is dominant. Sounds like the GS is the alpha. She also appears to be putting the dogs in their place when it comes to affection.
If the GS dislikes being sprayed with water than a spray water bottle works well to discourage behaviors. If that doesn't work then a very small amount of ammonia works. To test it take a whiff of the ammonia and water. If it's annoying then that's probably not too much. If it's noxious then that's too much ammonia. Adversion not punishment.
While away make the GS wear a muzzle while you work with her. Or you can kennel her to keep them separate.
Put the GS on one side and another dog on the other. Be affectionate with each and if one exhibits dominance then scold and ignore for a short time. Also take the GS's stuff and give it to the other dog and guard it. You can't just take the GS's stuff yourself but must give it to the other dog(s). Give the GS one toy and let her have that for herself but use aversion if she becomes aggressive about it and remove the toy. After awhile give he that single toy back. She'll learn its hers but she cannot be aggressive.
Be the only dominant pack member of the home. If she is aggressive then dominate her right then and there gently though. Don't create fear. Use your hand on her throat gently simulating a bite submission hold. You don't have to do it long. I don't like rolling the dog on its back and holding it there but it has its place on occasion. You can also straddle the aggressor. If they tuck their tails, want to lick afterwards, and lower their heads and avert their eyes then its working.
Finally, take those two dogs on long enough walks to create moderate panting and fatigue one on one side of you and the other on the other side. This reinforces your dominance and their equality as being submissive. Exercise will take away most aggression as does play.
Try those first and see what happens. I prefer the muzzle to the kennel but whichever the dog dislikes the least is the way to go. And the muzzle lets the dogs interact without the possibility of biting and injury. It takes a day or so for most to get use to the muzzle.
Good luck and don't give up.