If she is Swedish and brings the proper papers to the airport - evidencing the name change + the old (but revoked) passport (she should not throw that away after new passport has been issued) I doubt she is going to face any problems at check-in (I assume that you are on the direct TG 961 to BKK) - the risk of not being allowed on the flight would have been higher flying into Europe.
There is no need to waste more time trying to get a name change.