Hi,
I am a natural born U.S. citizen. My wife of 14 years, is from S. Korea and acquired her permanent U.S. residency and green card in 1990, three years before we were married. After we got married we both assumed that since she already had permanent residency and is now married to a U.S. citizen, and we now have 5 kids, all born here, that she could pursue citizenship someday in the future, but it just never became a big issue.
Well, recently she's been talking to friends and they've been encouraging her to look into becoming a citizen. So then we dug up her Green Card and noticed that it has been expired since the year 2000. To my great shock, it appears that her permanent residency was only permanent for 10 years. During those ten years we/she has changed addresses (within the state of Maryland) and I don't think she ever filed a change of address form.
She has a regular Social Security Card with no restrictions (ie. work, etc.) and has held several jobs over the years and we've been filing taxes jointly.
Q1. What fines, fees might be associated with the change of address, and renewing the expired Green Card?
Q2. Would she actually be considered an "Illegal Alien" at this point since her permanent residency/Green Card has expired?
Q3. Should we be concerned about her being deported?
Q4. If she were to travel to S. Korea to visit relatives for a couple of weeks, would she have trouble re-entering the U.S. without renewing the Green Card?
Q5. Should we renew her Green Card, and then apply for her Citizenship, or should we just apply for her citizenship directly with me (her husband) as her sponsor.
Q6. What is the most efficient/streamlined way to approach this?
Q7. What if we just continue to ignore this for a while?
Any insights would be greatly appreciated.

