If you stay aboard for most of the summer, there is something in particular that she doesn't like or fears. Discuss it with her. It's very possible there is a good compromise, as many have suggested. It is also possible there is a non-starter. Find out what you are dealing with before you toss random arguments at her and let us know. We can offer compromises, not wins.
Be very prepared that you may hear something you really don't expect, or if she has no reason, it may simply be a reason she is uncomfortable telling you. Show her you won't be offended or upset by it.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.