Welcome to VJ!
Let her Start the Process after she has become a USC.
The Process takes about 5-7months without RFE's.(Request For Evidence")
USCIS adjudication officer uses RFEs to request additional information on the pending application under any of the following circumstances: (1) Something is not clear in a case that you have filed; (2) If there is a document missing; (3) the officer needs updated information on your case; (4) the RFE notice was issued by mistake or in error; (5) the RFE letter was issued for any other reasons the adjudication officer likes.
An RFE doesn't mean that USCIS is about to deny your case though.
The best way to avoid an RFE is to get your case prepared and filed properly BEFORE your case is submitted to USCIS. You can get several examples from VJ's vast resources if you are willing to put in the time to research.
Check the ff:
1.http://www.visajourney.com/content/k1guide
2.http://www.visajourney.com/content/k1flow
3.http://www.visajourney.com/content/k1tips
cheers
S_R got a reaction from LoveNigarmostyle in HOW LONG IS THE PROCESS FOR PROSPECTIVE MIGRANT