We did this exact trip with a 14 month old, Brisbane to Singapore to London to Glasgow. Loooooong trip. Bring lots of things to entertain her! Our DD handled it better than we thought though, but she didn't sleep til she got to Glasgow. I'm not kidding. I was hoping she would sleep most of the first flight, but she managed to stay awake more than 36 hours straight.
Don't forget something for her to be chewing on or drinking (bottle) at take off and landing to help with the pressure in her ears. Thats all I have, I have only flown with a 3-4 month old and she slept the whole way. Don't stress about what anyone else is thinking on the plane if DD does make some noise, it can't be helped and you don't want to get stressed trying to keep her too quiet.
Maybe a few new toys to spark her interest and rotate the toys so she does not get bored with them all to quickly.
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