My 75 year old mother will be flying alone from eastern europe to western europe with possible layover in US until she will arrive to my neck of the woods in Texas. She does not speak English but she did know some german a while back. Would like to get assistance from an airline so she won't get lost during layovers. Other idea is to send her a sim card so she can call me from europe and possibly USA if necessary. Any suggestions on what I can buy here that will have reasonable roaming fees?