A lot of your question I can't really answer without seeing the stuation first hand, but I would ask- how often does she get walked and how far?
At http://www.dogbreedinfo.com/vizsla.htm it says this about their temperment:
Loving, demonstrative and gentle, the Vizsla is somewhat willful and distractible, but smart and trainable. This breed needs a patient, firm hand. They are reliable with children, loving all the play they can get. Maybe to too energetic and excitable for very young toddlers, excellent for energetic kids. Able to adapt quickly to family life, and are generally good with other dogs. Energetic and athletic, the Vizsla must receive sufficient exercise or they may become destructive or neurotic. Socialize this dog well and get him accustomed to noises at an early age. It is very important to obedience train your Vizsla. They can get overly eager, prancing around you in sheer excitement. This breed is highly trainable and very willing to please; if you can get it to understand exactly what it is you want of them. If you do not train this breed they may become difficult to handle and control. Example: See Video. Look for breed lines that are not high-strung or shy. Vizsla are known as chewers. This breed is not for everyone. If you want a calm dog and are not willing to walk a couple of miles or jog at least one mile a day, do not choose a Vizsla. Without proper exercise, the can easily become high strung. They have many talents such as: tracking, retrieving, pointing, watchdog and competitive obedience. The Vizsla is a hunting dog and may be good with cats they are raised with, but should not be trusted with animals such as hamsters, rabbits and guinea pigs etc...
It could be more so than acting out that she is stressed out and getting high strung. If you, DH, a good neighbor looking for ways to excersise... aomeone could commit to at least 3 days a week of REALLY running her, it might help. It's at least worth a shot. Perhaps someone can Run her a mile or walk her 2+ miles on M/W/F and on part of the weekend you can take a family walk. Play is great for dogs, and helps exsert some of the energy. BUT- a "pack" is formed during calm exploration with one leader (a humane needs to LEAD her, not follow where she drags them.) and the rest of the family pack.