Hello, long time lurker, my girls got their machines at 7 and 11. They loved my Pfaff. At first, I taught them on it but then when they got their own machines they got lower end kenmores. It was so hard to reteach them! As my machine had many features that theirs didn't!
I now had 2 people at one time to share stash with - and they were into creating large scale projects. My advice is enjoy your daughter now because as they aged they have sewn less and less and asked for me to sew more and more for them.
OH, by the way several of our boys know how to sew too! I can at at least say that the majority of the 7 can handle a sewing machine for simple things and a handle needle two!
Lee