I am not flying Gulf so I can't help you with it. I wouldn't have refused my help if I had known about it a month or so earlier.

It would be best if you can call the airlines directly. Like you said, arranging wheelchair option (even if she doesn't need it) will mean she will be well looked after thoughout the flight.

Try this forum if you have any questions.
http://www.tripadvisor.com/ShowForum-g1-i10702-Airlines_Air_Travel.html