The idea of dominance has now been thrown out by top behaviourists as twoddle. It was a bit of a pain changing the midset after years of being told these things were down to dominance. If you do a bit of googling, you'll probably find references on this subject.
I also agree that this isn't a fearful behaviour..defending the camera bag and all.
The aggression in that situation is simply down to defending resources from an individual who the dog doesn't have respect for.
Dogs do view their human owners as sort of mother/father figures but we need to set a good example and act as a guide. If we let the dog have too much leeway and then try to take something away from the dog that it is used to getting, no doubt that dog will try and defend what it already has to stop it being taken away and will rebel. It's not about dominance as such and rather about lack of respect for your guidance. Young children are the same in this respect although it is important to not anthropomorphize, small children do learn in a very similar way to dogs.
She doesn't have a go at you because you've been everything that a proper guide should be and she respects you for it. As the others have not, this is why she shows aggression.
With food aggression, the best way to combat that is to teach them that you are all givers and not taker. Get two dishes for her food. Put the one she eats out of on the floor and keep the food in the other that you hold. Call her over for her food and put a little of the food in her eating dish and let her eat it. Once she's done, put a bit more in and keep doing that until it's all gone. She knows then that there is no point in growling at you because you're going to put more in, not take it away. This was a technique advised by John Fisher a former top behaviourist who sadly died. If you can get various family members to all do it in turn at different meals although you should do it at first if her aggression is too dangerous for the kids to try and then the growling in defence should cease because she'll learn that she needs to let you stick around so yiu can give her more until all the food in the first dish is used up and get her used to being touched a little on her main body as she eats the food but only once she's stopped the growling to start with. It will be a bit of an inconvenience but once she's fine with that, you can gradually cut it out the feeding her like this and just give it all in one go and, by then, hopefully, her growling habit will have gone. It will be well worth the effort because food guarders are quite horrid at mealtimes.
As for cat food, maybe feeding them on a raised surface so that, even if chloe manages to get into where the cat food is, she can't reach it. Thats what we do. The cats get fed on the side in the porch... out of Jess's reach.
Also, for a collie/aussie mix, 45 minutes when you get home from school might not actually be enough for a dog thats a cross between two high energy breeds. When you say collie, which collie breed do you mean? There are four of them and they can be quite different.
I have Border collies for example, the most energetic of the lot. 45 minutes a day for such dogs isn't enough really and they also need the mental stimulation as well as the physical. Lack of either can also cause frustration leading to aggression and thats why a lot of Border collies end up in rescues and such. Apparently, they are the number one breed to have problems with and thats because of unsuitable owners, not the fault of the dogs. I'm not saying you are unsuitable and you've obviously put a lot of effort into her but you need to remember the high levels of stimulation these dogs need and not just the physical type.
Another thing is that if a rapport doesn't exist between her and other family members, they aren't really going to get anything out of her. Dogs being sociable pack animals need to identify with their packmates on an emotional level and wolves are always undergoing rituals to enforce these mental and physical bonds with each other for this very reason. This also needs to happen at home. Thats why it is important to only bring a dog into a household if everyone in that household wants the dog and is able to develop a rapport with it.
I didn't read all the post admittedly but where aggression is concerned and, especially with kids, it is much wiser to have a pet behaviourist come in person and see her with their own eyes around all members of the family and perhaps arrange for a visitor so they can see the dog with them.
Giving advice over the internet for a situation that you aren't 100% on can be quite dangerous, even though I've just given some...lol, and even top behaviourists won't do it. I doubt the advice I just gave would be enough to sort everything or all the other advice in the thread either because none of us has been able to witness the general situation first hand or had the full training needed to become a qualified pet behaviourist.
Hope you manage to find one and nip the problems in the bud now.







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