I think that is a great idea.
I grew up actively involved in 4H. LOVED IT!
I wouldn't think it would be an issue for her to show your newf. As long as they are both trained. When I say both trained I mean, in our obediences classes I've learned more then the Mister that's for sure.
Our training classes teach us hand/leg signals to ensure we are always heard. And as dogs get older some tend to lose their hearing.
As far as companion dogs go,google it for your state. I think every state has different requirements.
Hope that Helps
Krystal