Howdy and welcome.
Sounds like you have your hands full with all your pups, but thank you for rescuing and foster.
It may not be aggression at all and instead resource guarding. Not knowing much about her past care or how she was weaned it is very possible she had to assert herself to get food in the first place. It is normal amongst well socialized puppies and with proper training it normally goes away.
I do believe you are on the right track with NILIF training in this case, and for now I would indeed separate her only during feed time until she can be civil around the other dogs. Mine have zero aggression towards each other, but they still get feed a good 5 or 6 feet apart at all times, they can and have eaten out of the same bowl however.
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- My thought after reading what I've read is to quit free feeding and to practice NILIF. I understand the concept but I'm unsure how to apply it.
Basically NILIF enforces that you control all resources to an extent. Food, outside, walks, fun, play are all property of the handler and in order to get any of those rewards the pup must show their willingness to be calm and listen and sometimes do an action in order to earn it. These are a working breed, they do not mind doing menial tasks if the reward is there.
By asking for a small action or even just attentiveness and calmness for an action on your part it starts to instil a sense of respect between you and the pup. You'll probably start to notice a lot more eye contact and manners in no time.
In terms of feeding you can try:
Fill a bowl of her food and hold it slightly above her nose. Let her really sniff it but not see it at all.
Request Miska sit or slowly move the bowl above and over her head so her nose follows it. That movement should help her sit all by herself if not you can apply a bit of a push on her hind to give her a hint.
Place the food down by your feet, not hers, once she is sitting and every time she tries to move forward to it tell her NO and block it... If it becomes too much take the food away for 5 minutes or until she has stopped searching for it and start over.
While blocking allow her to see and smell the food but never get to it.
Rewarding the food is done when she is sitting, giving you distance, and LOOKING AT YOU AND NOT THE FOOD. just because a resource is on the floor doesn't mean it is hers is the idea you are trying to convey here.
I would also think about hand feeding her slowly for the time being. You might get a finger nip here or there, but it will really cement that people can be trusted around her food at all times.
Once she has a firm grasp on that I would probably use the calmest and best behaved pup I had and feed those two alone for some time. Hand feeding Miska while the other one ate beside ME and then after some time beside each other with me stopping any problems... Again for me beside is 5 to 6 feet apart.
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- I'd really like to be able to exercise Miska but she's not done with vaccinations and I can't walk her in the neighborhood yet or take her to the dog park.
A good round of training is more exhausting for her than anything right now. Mental stimulation is HUGE and good enough for the time being.
Teach her tricks or commands in the time being... Alone in a different room if she has trouble focusing, but that alone she help you two form a bond and understanding on how to respect one another.
I'm sure other members will offer some advice as well
Best of luck and come here when you need to vent or any other challenge you have
I hope it helps,
~Chris~