Having a disability does not impair service. You will need to use service of process that is legal in Jamaica and in Florida. There are companies that specialize in worldwide service. Make sure you use someone reputable, not just cheap because if you do it wrong it would hold up your divorce case.
Good luck.
Service upon a disabled individual is no different than service upon any one else. For the service to be effective it will need to be done according to Florida rules. If you know where she is located within Jamaica service should be relatively easy to accomplish.
Sincerely,
Daniel Bachert, Esq.