If you are returning on a flight, yes. Otherwise with a birth certificate or driver's license is enough.
No the Himalayas do not cross Mexico. The Himalayas are in India and Mexico is not.
A Mexican government-issued passport and a US Government-issued visa.
If you plan to drive there, you will need your driver's license. If you are not a US citizen, you will have needed a passport from your country to cross the border but once you are in the US, you don't need to pass any further ID checks.
Possible. Was she merely turned around? or was she charged with a crime? If she make affirmative statements that she was indeed a U.S. citizen, that is a PERMANENT bar and would never be able to enter the U.S.
No. No foods are allowed to cross the border.
The easy part is entering to Mexico; however you will have to explain you situation to US Homeland Service officers on you way back to the US.
Yes
No.
You drive down to Mexico and cross the border. Now your Kentucky title is in Mexico!
http://www.canadainternational.gc.ca/mexico-mexique/consul/visas.aspx
Either California, Arizona, New Mexico or Texas.
Because it is the number one sport in Mexico