Travelcalm or any other travel sickness tablet can also put the mind at ease for the person taking it. Some say that you'll be sick because you're worried about being sick. For some people it's all in the mind.
If she takes a travel sickness tablet, she may think "hey I've had a travel sickness tablet so I should be ok".
I reckon she'll be right.
Wombat, take a chill pill, it's only 5 mgms