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. 
What was directly across the road from the school you went to?
What has survived in your garden with minimal or no watering?
