I'll tell you what I did, but be warned that my app is in process so I'm not 100% sure I did everything right:
As far as I understand visa overstay is forgiven for immidiate relatives, as long as they entered the country legally.
Yes, but only if she leaves after receiving the green card. Since she will have overstayed for over a year, she will be subject to the 10 year bar if she leaves the US prior to receiving a green card. Also, she can't use advance parole.
Still, what should I write in I-485 and I-765 for the question "what is your current USCIS status"? Should I say "visitor", or "visitor (expired)", or..?
I wrote "overstayed tourist visa"
In I-130, question 22 (where relative will apply for AOS): should I write the consulate abroad where she will apply if not eligible for AOS? (Actually she does not have this option, since she overstayed the visa; and she is eligible for AOS)
I put the local USCIS office on the left and put N/A in the consulate part on the right.
In g-325a - my mom did not work for last 10 years, and she does not remember address or dates of her last employment - how important is to get the precise information about her last occupation?
Don't know. I guess you can write what she remembers (eg industry / decade), and write "don't remember" for the rest.
Also, should I attach a cover letter explaining the reasons why she overstayed her visa and changed her intentions to apply for immigration benefit?
I did.
-ML
K1 -> I-485 -> I-751 -> N-400
Filing I-130/I-485 for parent:
DO: Santa Ana / SC: California Service Center
5/13/08 - Parent I-130/I-485/I-765/I-131 mailed to Chicago Lockbox
5/22/08 - checks cashed, receipt numbers from Missouri MSC (NBC)
5/25/08 - Notice dates for all notices
5/29/08 - LUD I-130/I-485/I-765/I-131 (received and pending at NBC)
6/07/08 - Fingerprint appointment letter received
6/12/08 - Fingerprint appointment date
6/12/08 - LUD I-485/I-765 (no change, still received and pending at NBC)
7/29/08 - LUD I-485 - RFE sent out, case on hold
7/30/08 - LUD I-485 (no change, still on hold for RFE)
8/04/08 - RFE received, request for tax return, 87 days to respond
8/05/08 - Sent RFE response to NBC (regular mail)