Yep. My wife entered the US only 30 days prior to out 2 year anniversary. Now, after having been through the complete absurdity and hassle of an I-751, I wish we had waited.
I would contact my Congressperson's office to ask then to inquire. If you need proof of status, call USCIS and say "infopass" at the prompts. You can get an ADIT stamp to then show as evidence of status.
Only if she receives an approved Advance Parole Document approved before leaving. Leaving prior to approval will void her adjustment. The chances are not good for approval within 90 days of filing.
Not sure that the process is shorter, but filing online is easy and convenient. Just answer questions and upload documents. Receive receipt immediately. Wife was a citizen in slightly more than 5 months after filing.