If you haven't seen a major transformation yet, it may be coming. I have a 13-year-old too. I swear, I had a little girl in March. Now I have a young women both physically and mentally. In March, the idea of sending her to high school was scary. By September, she just fit right in. I'm guessing in another year, she could waltz on a college campus and no one would be the wiser. DD has always schooled with older kids due to the grade skip and subject accelerations. Plus, she's in theatre and so been working with kids through 19 since age 8 and with professional adults from age 10. She has friends in college now (no, she doesn't go to college parties but when they are in town, she gets together with them, they see plays, they go do more open-aged activities, they keep in touch during the school year.) Her comfort level for mixed ages is extremely high as is most theatre kids. I credit theatre largely for her ability to also be a "child." They tend to be very playful, often shun pop culture and are unashamed to play openly with little kids, to love Disneyland, to watch cartoons, ect.
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You don't say what grade she's in but if she hasn't started high school yet, she may feel differently about heading off to college when she gets there. My DD has certainly found it more challenging than she expected. It isn't so much the work as the expectations. Yes, the teacher's expect more but she's also no longer in classes with kids who don't care. She's in classes with kids wanting the perfect college application. The biggest challenge of all has been striking balance between academic and social life. The pull of boys, texting, facebook, parties, outings with her buddies (and without adults)... it can all be a major distraction and I know my own DD has taken some missteps academically trying to figure it all out. Plus, high school activities really take a commitment jump in high school. DD can easily fill 20 hours a week on theatre alone. We know high schools kids who do the same with dance, music, sports, ect.
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Have you looked at different ways for her to do college work? Our county has something called "middle college." It's for 11th and 12th graders. They take their classes at the community college. They get both high school and college units for them (real credits that can't be dismissed like the AP's.) They do have a class where they are together with their agemates (about 20 kids allowed to do this per district.) They have a prom and all the things high schoolers would want that aren't available at the JC. Plus, the state pays for this college (accept for books) because it's also high school for minors. My own DD is planning this and she has many friends who do it. We'll see when the time comes though.
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If she's not in any mixed age environments now, I'd perhaps look for one for her to be involved with. I think you'd be surprised how easily she adapts to being with older kids.