Her friend has arranged transportation upon arrival, I am looking for any useful information to provide regarding what she should expect at airport etc.
if she has arranged transport she’ll be ok, it’s normal entry procedures (reason for visit, stamp, anything to declare, ok) - just tell her to keep her head on a swivel.
It's nothing like our TSA. They will size her up quick and let her through with best wishes. Tell her to schedule any outdoor activities within the first 3 days because by day 4 she will need to stay very near a toilet, day and night.
Tell her to take some rifles and ammo. She’ll get to stay indefinitely for free, but she’ll miss the wedding. She’ll get to know a few mexicans very well.