Northwest Airlines has a handy
link on NWA.com to the Timatic system. This database is maintained by IATA and has information on entry requirements based on all permutations of natioanlity (passport held), country of residence, country of embarkation, etc. Since you still haven't disclosed the particulars of what country's passport your friend holds, her residency status in Germany, etc. one cannot even begin to speculate what the exact visa requirements are. No materr what, however, this information is in Timatic regarding Thailand:
Quote:
- Those travelling to Thailand with a visa issued prior to
arrival, are permitted to travel on a one-way ticket.
- All visitors must hold documents required for their next
destination.
Warning:
- Non-compliance with visa requirements will result in:
- refusal and immediate deportation of the passenger; and
- fines for the airline of THB 20,000.-; and
- overstay fine for the passenger of THB 500.- per day (but
not exceeding in total THB 20,000.-).
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So you see, with the one-way ticket the airline representative was
correct because according to this information you cannot travel on a
one-way ticket to Thailand and obtain a visa upon entry.
I'm afraid you're going to have a tough time getting your money back if
you purchased non-refundable tickets. It is your responsibility to know
the visa and entry requirements for a particular country before you buy
tickets to go there.