[concretegurl]

Can you go on eBay or Amazon and get one of the child safety gate systems the kind that looks like an xpen but they are much cheaper-they look like 6 baby gates in a hexagon.

Put her in it and have her around the other dogs but in there she cannot get to them or you.

At feeding time put the bowls next to each other on opposite sides of the enclosed play area (did that make sense-?) like feed K. inside the pen and your dog on the outside but s they are forced to eat right next to each other but with the gate between.

The biting must stop or be prevented controlled in the immediate.
Since you cannot contact this dog for rescue yourself until either (check local laws) your sister agrees to sign her over or she is considered abandoned you are stuck with her and she will you (bless you for being stuck in this situation period).

Start making mental note at what causes the aggression.

It might be general food aggression which is often based on a behavioral issue caused by neglect or it could be territorial aggression or both.

This is usually fixable-with time and forced safe exposure.

I know many people are oppose dot this methodology but I have personally seen it work and swear by it.

Please update.

This will take time-you are not only training- you are undoing years of bad training.

As far as the rest use the enclosure play yard and when you take her out use a harness and leash-you are in control she will be forced to listen and it will aid in taking her to potty outside as well as keeping out of trashing your house and away from the other dogs.