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Also, don't acknowledge her when you first come in. I know its hard but just ignore her for awhile. No giddy, goggly talk by the gf or anything either. Just let her calm down.
I am not an expert at all but just something I thought off while reading this. I am not sure it will work or is the right way to go about breaking the pee habit.What if you greeted and played with her outside when you first get home. That way she gets a lot of the excitedness out of her system before you let her in the house?
This is an easy problem. Pups shouldn't be left alone with other dogs when you're potty training. You said she can be outside for hours in another post and come in and potty. She's out with the other dogs distracted. I think you need to crate her, no free time with other dogs. Let her out of the crate to potty. If she doesn't go, back in the crate. There is no benefit to letting a pup have a bunch of free time unsupervised with other dogs. All that can really happen is pup will get hurt playing rough.
From the time my dog was a puppy I would leash him when we took him outside for potty. I would say to him "go potty".........pause and wait "go potty" ........until he would find his "spot" and lift his leg. Then lots of praise and a treat when we went inside. He quickly learned that he got a treat if he went outside and went potty. If he didn't even try to go........ then no treat. Now he will always try to go if I ask him to no matter if it is before getting in the truck or before going into the house. Also, ignoring them for a few minutes will help wonders. Then when YOU are ready to give attention, you make them sit before you touch or speak nicely to them. I'm all about loving on my dog but it's ALWAYS under my terms. Also, puppies (like kids) need consistency......do it the same...... every time........every member of your household.She'll get it......just keep trying. Also, remember, you want to be the alpha in her pack, so I second the time away from other dogs initially. She will follow the leader she spends the most time with.