Sorry to be a bit off earlier but in reality the staff on these long haul flights have all sorts of ways of helping out - also she will probably sleep for a lot of it - in the olden days the doctors could prescribe medication (fenagen) is a name that springs to mind - had a friend (really) who used it for her five children when travelling any distance - was shocked at the time but can see for a long haul flight it might be useful - if allowed nowadays I don't know - but could check with GP as to whether anything can be taken to help with the journey. Trying to be helpful as opposed to flippant as before. 
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