I remember once we were on a public range (25 years ago) and all of a sudden the range master was blowing his whistle like crazy, and so we all stopped doing what we were about to do and paid attention. And then we watched a doe and two older fawns cross the backside of the firing line out about 150 yards. Of course the comments and jokes started, but it goes to show you what deer can get used to.
I have shot on my range, but the gun away and looked out the window and saw deer in the back yard already. So you'd think that the gun fire would have scared them out of the area, but I think I have trained mine and they know that I am not shooting at them.
It sounds like your wife is all set to shoot her buck.