1.) Was the Mortgage vested as follows: "Gabriele X, a Married Woman, as her sole and seprate property?
2.) Does the recorded Mortgage included a Second Home rider?
3.) Does your Marital Separation Agreement list the house as a sole and separate asset for you?
If the questions above are all yes, you should supply the bank with a copy of the Mortgage & all riders plus a copy of your Divorce Decree and MSA (Marital Separation Agreement).
Keep in mind that it is very difficult for a married couple to purchase assets (such as a vacation home) in Florida outside of the community property rules... your lender is basing their thinking on the norm rather than your unusual exception.