Agree with all the above. Ask her to take the center cabin because of less motion and noise, might psychologically take the edge off. My wife gets motion sickness sometimes (planes/trains/automobiles and yes boats), but with the patch and/or Bonine she has always felt fine on a cat. Have her ask the doc for advice/prescription and start it a day or two early. To repeat, going below when youre not feeling well will not help in most cases.
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