As @Becuzz states, you need to present a compelling argument to get your wife on board.
The most common method to do this is to list the pros and cons of making a move. Are you unhappy in your current location or merely irritated? If you're genuinely unhappy, a move would be a pro. Does your wife have a job at present? Does she love it? Will you be moving to a location with better schools? Will you be within easy traveling distance for visits? Are your in-laws willing to travel to see you in a new location? Can your family Skype? Do you take vacations together? Might this be a possibility? Will you be making significantly more in your new job to allow for things the entire family would like (like quality family vacations)?
The lists are long. They are a starting point for serious discussion in place of "my opinion"/"your opinion" type arguments.
I don't think children should have input weighted equally with your wife's, though they need to be heard. You are responsible for the well being of your children, but you are in a better position to determine that than they are. (Better schools, less drugs, better community, etc. are issues adults appreciate more than 7 year olds.)
It might be that when everyone contributes to the pros and cons, you will see that your desire to move is not in keeping with the happiness and well being of your entire family. Maybe everyone will be surprised to find a move would improve family time.
...what impact will this move have on my daughter if I go through with it? What will it teach her about what are our priories in life?
What are your priorities in life? Actions always speak louder than words. You should decide this before you move.
If you make a unilateral decision, it will teach her that what the women in your family want is relatively unimportant. But if it is a reasonably democratic process between your wife and yourself, it will teach her that you care about your wife's emotional well being, which is an important lesson for a young female to learn.
Good luck. Moving is never easy.