You may find it hard to place an epileptic dog. It also sounds like you already invested a lot of time and money in this dog.
What kind of training was tried?
You wrote that she gets a lot of exercise. Is her exercise just being allowed off leash or does someone throw a ball or interact with her in some way?
Many dogs don’t exercise on their own. They crave interaction. Take fifteen minutes and play with her in some vigorous way - throw a ball, pull on a rope, chase her, kick leaves, run with her, or anything else that leaves her panting. You can play scent games with her too.
Crate her for a part of the day, dinnertime would be good. Teach her to lie on her bed for an extended period of time with the down stay.
Set her up when someone comes to your house. Put a leash and prong collar on and let it trail. If she goes to jump, yank on the leash and yell no. You can warn your guest that you will be training your dog.
Keep your garbage covered or set her up for correction if she goes into it. Ditto the counter.
As to the children’s toys I might be on the dog’s side on that one. How is she supposed to know which items left on the floor are permissible to chew? Have your children put away their toys if they are not in the room.
What I am hearing is a dog who is bored and longing for attention. With a little effort her needs and yours can be met.