Some dogs aren't into affection, regardless of breed. Some just want to be left alone and chill by themselves in a comfy space. Unless this is a sudden change for her, I wouldn't worry about it. Just make sure to only give her pets and affection on her terms. Getting up and walking away is a perfectly reasonable action for her to take when she does not want to be petted, so don't force it.
She's most likely a resource guarder, guarding beds and treats. Simple solution to that is don't have food laying about and never make her feel like she has to guard. So no food around the other dogs, no chews around the other dogs. She should be physically separated from the other dogs when food is involved. For guarding the bed, don't allow her access to the bed anymore. If she can't be up there, she can't guard it.
As for the shedding...well, not much you can do other than making sure she's groomed. You can take her to a professional groomer. Sometimes diet can effect shedding levels. And some dogs just shed a lot. Little you can do other than vacuum regularly.
She's most likely a resource guarder, guarding beds and treats. Simple solution to that is don't have food laying about and never make her feel like she has to guard. So no food around the other dogs, no chews around the other dogs. She should be physically separated from the other dogs when food is involved. For guarding the bed, don't allow her access to the bed anymore. If she can't be up there, she can't guard it.
As for the shedding...well, not much you can do other than making sure she's groomed. You can take her to a professional groomer. Sometimes diet can effect shedding levels. And some dogs just shed a lot. Little you can do other than vacuum regularly.