First of all I applaud you for thinking about the future and thinking about taking your daughter turkey hunting with you. As long as you make it fun and concentrate on the real pleasure of spending time with your daughter, you could take her at just about any age. You know better than anyone else what her attention span is and I'd use that as a guide. You may even want to just take her to the woods, no blind, no gun and just see how it goes when the 2 of you sit by a tree and just observe nature together.
I've just never been a fan of blinds, at least the type that you carry in. I agree with Steve about taking a pair or pruning shears and cutting some small branches that you stick in the ground to help hide some movement. A big wide tree or "blow down" serves very well to conceal a little movement, if you do it slowly.
I have found that one of the most important things to consider, especially if you are hearing turkeys around you, is your set-up. It may well be that you may just need to move a bit to get in a better position. If you've not read the article "Good End of Season Advice" on this site, I'd recommend it.
"If he's out of range, it just means that he has another day and so do you."