The following is from frequent asked question of state of department of usa
Q. Can a J-2 apply independently from the J-1 for a waiver of the two-year home residence requirement?
A. J-2 cannot independently apply for a waiver. However, in cases of death or divorce from the J-1, or when a J-2 child reaches age 21, the Waiver Review Division may consider requests for waivers on behalf of the J-2 on a limited case-by-case basis. If the J-2 feels that his/her case merits special consideration by the Waiver Review Division, he/she will need to complete Form 3035 on-line, pay the processing fee, and submit the appropriate statements of reason. The Division will also need the J-1’s DS-2019/IAP-66 forms and divorce decree or death certificate, whichever is applicable. For a dependent J-2 son or daughter who has turned 21 the Division will also need a copy of his/her birth certificate.
http://travel.state.gov/visa/temp/info/info_1288.html