Ann Marie ~
I always find it sad when relatives become cold, hard and unforgiving over relatively minor issues, like your not going on a cruise with your cousin. Really. How serious is something like that? Frankly, I just feel pity for those who are so self-centered and petty as to make some perceived slight a rationale for cutting you dead. However, this is clearly hurtful to you and it may well be a case of mis-communication, but then, from what you posted, it appears as if you and your husband practically groveled to your cousin, explained the situation (your health issues), apologized profusely and still, she's decided to be angry, no matter what. From your account of your history with this woman, it appears to be a one-sided 'relationship' and while I agree with Sue that it's 'nice' to have cordial relations with family, sometimes we have to face the reality of who these people really are and what the relationship really is, rather than what we would like it to be. In this case, the cousin appears to be determined to play the victim with you as the 'villain'. If this split is truly important to you, as it seems to be, then I would seriously consider attempting to talk it out and explain - not just why you canceled the cruise, but why you did so without informing her of your plans, first, which, I suspect, is the real source of her animus toward you, although I'm speculating and of course, could be mistaken. If she won't talk to you civilly, perhaps a letter might be a better tactic. In any case, I'm sorry to learn of your anguish over this unfortunate incident and hope it can be either remedied or surmounted in some way.
Jim