lovemyava
It's too bad you don't live close enough I'd turn her loose with my girlz, but then she may learn some new tricks.

We have a 100lb lab next door and the girls get together with it and just pound on each other. Never biting or aggressive, but man are they rough with each other. They've broken off most of the low hanging branches on the bushes in the yard to about 22" off the ground.
Somehow Vizslas earned a reputation for being a timid, meek dog that wouldn't get very far from their owner, hence the term "Velcro Dog". Nothing could be further from the truth though, and the term "Velcro" was first used to describe an undesirable trait of the breed.
Compared to and English Pointer or setter, or a GSP which can be a 1/2 mile away at any given moment, and require a horse to keep up with it, having a Vizsla that stays in sight was "close working, or too close for some, hence "Velcro". If your dog wasn't 600 yards away, well it was too darned close and underfoot. :
I know a lot of folks on the forum use and like the dog parks for socializing, and there is absolutely nothing wrong with that at all, but realize that there a many, many thousands of hunting dogs that have very little contact with other dogs, except during hunting season, and they are just fine. I wouldn't personally place as much emphasis on socializing as obediance training and just becoming a partner with your dog.
I actually try to keep my dogs away from other dogs. Having a "friendly" hunting dog isn't always well received by other hunters.
If I could, I would recommend that you go back to the hunting trainer again, but this time let she/he know that you are having problems reinforcing the lessons and have them "train"you too. There are so many subtleties and small cues associated with training that need to be learned to even begin to be successful. If she did well with trainer, stick with them.
Madaboutvizslas.
I had a dog ( Boone) do the same thing, and man did he knocked that other dog on it's keester. He could hit like a sledge hammer He also taught that dog in one lesson to not break for a retrieve until sent. That poor dog wouldn't move from the line unless Boone let him. His owner would send him on the fetch and he'd sit there and look at Boone. We had to put Boone in the truck to get on with the lesson.
He did the same thing with a bird once also when he was being harassed by another dog on the retrieve. He put the bird down and lit into the other dog, then calmly went back, got "his" bird, and brought it too me.