15 min whatsapp call- USA tax CPA consultant - see question below

Background: A. I'm a usa citizen who got naturalized at 14 (2007) when my father got US citizenship. B. I'm now living abroad and has been complying to all tax report for the last 5 years. 2021 income was 70K. C. I'm marrying a non-US citizen, whom has been in US (California) during her college year. Now she's back in cambodia. €€-€€€€€___ In case my wife doesn't want to have US citizenship. 1. She has business and property here in another country and doesn't want to get involved with USA tax. Will there be any US tax application on her when my marriage with her is a marriage between a Non-US and a US citizen? In case my wife becomes US citizen 2. Will there be a division of property acquired before and after US citizen? 3a. Will she be taxed for revenue stream generated by the property acquired before US citizenship? 3b. Will she be taxed for capital gain generated by the property acquired before US citizenship? ---_-____ 4. Inheritant of nonmovable property (land) from a non-US citizen mom to a US kid. How does tax work? 5. Let me give you a few scenario i. My wife. During non US citizen, she bought a property for 100K. After she become us citizen, she sell it for 600K. What US tax she pay? ii. After US citizenship, She bought a property in cambodia and later sells for profit, she will have pay Income tax on the property (capital gain), right? And what is the current rate? iii. My wife bought a property for 100K during non-us citizen, got married with me, has a kid who is a US citizen. Later on, the kid got inherit and the kid sell the property for 600K. What tax does the kid pay?