Me and my wife both have J1 visa, can she switch to J2

My wife and I both have separate J1 Visas. But my wife program is a 2-year program and mine is a 5-year program. After she is done with her program can she switch to a J2 visa under my J1?

Also, does she needs to leave the country for this? Or can she stay in the US while we do all this process?



Thanks