I would think this would be true for most people.

I have no idea how to "reduce the effects of turbulence", which you've now explained as meaning she wakes up. Maybe get lots of exercise before the flight so she's tired, or take a sleeping pill.

Or just be tired and get sleep the next day when she gets off the plane. I can't see how this is really such a big issue once or twice a year.

P.S. Is your post serious?