To me it’s a novelty. Yes, on a vacation etc their fun but I doubt she will use it past the initial excitement. Plus I agree she needs to sit in it before. It might be comfortable for you but not her. Maybe go shopping and see if she would like it. You don’t have to say you’re getting one but if her answer is like “I don’t think I would ever use it”… Than you got your answer. But I do give you credit. My wife would be like “and when does that go back to the store”? Lol.
You would probably save money and get her a package of full body massages somewhere. 