You may have to call the IRS for a progress report if it has not made its way into the system. Innocent spouse claims take a long time to be processed. From the IRS' FAQ on Innocent Spouse Relief (I have included a link to the FAQ below),
"When a Form 8857, Request for Innocent Spouse Relief, is filed with the IRS, it may take up to 6 months before a determination is made. During the processing time, the Service is requesting your tax information and contacting the non-requesting spouse. By law, the IRS must contact your spouse or former spouse. There are no exceptions, even for victims of spousal abuse or domestic violence." (emphasis added)
IRS
Innocent Spouse FAQ
