Travelling on a US passport my 20 year old daughter will be part of a movable education program under the auspices of Grinnell College in Grinnell, Iowa, USA and Antioch Education Abroad in Yellow Springs, Ohio USA. They will use up their 90 days of tourism during the program. She would like to stay abroad for a few weeks and my wife and I would like to visit her at the end of her program.
How can she stay longer than 90 days without getting individual visas to several countries? Your help will be appreciated.