@sacwb3,
I get why your wife is upset.
I also get your thinking, but you don't seem to have thought it through all of the way.
Some elements:
- You were reinforcing to your daughter that if her mom says no, she can go behind her mom's back and get a "yes" from you -- you need to present a united front.
- You set up a false choice. If your wife feels strongly about not giving the iPad until Christmas -- and I will go into possible reasons for that later -- then you're putting her in the position of either telling your daughter that her presentation was unconvincing (which I doubt she would want to do, especially if your daughter worked hard on it), or acknowledging that the presentation was good but the answer is still "no" (which your daughter will almost certainly find unfair and be mad at your wife about), or going ahead and saying "yes" when she'd already indicated to you and your daughter that the answer was "no" (until Christmas).
- You put your wife in the bad guy position instead of sharing the "blame" (for not getting the iPad before Christmas) equally.
Now, possible reasons why your wife would want to wait until Christmas:
- You have to get your daughter something for Christmas, and iPads are not cheap. Much easier to kill two birds with one stone, there. If you give the iPad now, you'd need to do something else for Christmas.
- It's part of growing up to a) delay gratification and b) not demand something shiny because someone else has something shiny! 9.5 is definitely old enough for that.
- Something is often valued more if there is a period of anticipation before actually getting it.
Overall, I think you really should have talked to your wife before offering your daughter that route to getting the iPad before Christmas.