I wouldn't call this a "regular" puberty story. The problems here aren't particularly unique in type, but they're extreme in severity, probably in large part because of the few years' displacement.

Comparing groups I taught, the gifted 9-year-olds were typically quite a bit less mature than even the remedial 12-year-olds. A few years more of experience and brain development does wonders for one's ability to make good decisions.