Ok, here goes...
I was already on the younger end of the bracket for my grade...two weeks into first grade I was moved to second grade. Socially, it wasn't too bad since kids don't run around constantly asking each other 'How old are you?'. It still came up once in a while, and it was a little nerve racking dealing with the 'genius' and 'wonderkid' crap. But, not too big of a deal...
...fast forward to high school. I didn't turn 16 and get my license until Jan. 31st...of my JUNIOR year in high school. Socially, a MAJOR pain in the ass!! I had a lot of angst to constantly deal with from almost the beginning of 10th grade until that day as I had to constantly be the 'Come pick me up?' guy...
Needless to say, being a skinny little runt didn't help my cause for playing HS sports, either...
So, here I am; 33 years old, and didn't finish college (fishing, hunting, and hanging out were more important). I still ended up with a good job, nice toys (sled, drifter, truck, etc.), played some semi-pro ball, and am mentally balanced (I think?).
The whole thing would've worked out even better, I think, without the parental units divorcing when I was 12. My mom claimed me and proceeded to move 4 times in 5 years chasing her career. Right before the last move, I called BS and moved back here to my dad's as I knew I wouldn't have to move again (Hanford). THAT was the cause for the 'friends are the most important' attitude that left me not finishing a degree.
Alright (I can't believe I just put that on the internet), as for my advice...tough call.
Where are her social skills at right now? Look hard. If they are really good, I think she'll be ok. If not, I wouldn't do it. As I said before, it's not the early years that it will matter as much. HS is the major challenge, and if she's not ahead of the curve socially now, it may sink her then.
Good luck,
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Hey, you gonna eat that?