First off, what does her doctor say? A cyst does not sound like it would be an major issue at this point, since she has seen the doctor,and on meds, but, you never know..Her age might factor into an unexpected issue...
I hope you do have travel insurance, with good medical coverage stressed. Talk to your travel agent and more importantly, her doctor.... wishing you both a good cruise.
Trip, with her book & tea!
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