Sry for your troubles.
As we know from reading the forum, a lot of alcoholics are fabulous, intelligent, very loveable people WHEN SOBER it is only when they drink they become unreasonable, mean, nasty and unloveable. But we always know that there is this other loveable person in there somewhere and that is what keeps us loving them. It sounds that you have done everything you can at this stage to help your fiance and that right now you can do no more.
The thing you need to do now is try to safeguard yourself. When the cops turned up at your place they will have seen that she was drunk and that coupled with what her uncle told them would I think make them not take her seriously, and this should be on record.
I would do what the others have advised and go to the police yourself and explain the situation, and ask for an escort to get your own stuff. Take the joint lease with you and if you dont have it a letter off your landlord.
Once all this is done, the fear of the police having issued a warrant will be gone and at least you will have your own possessions back then you can think more clearly about what you want to do next.
It is sad that your fiance could not or would not accept all the help that was offered but you cant make her she has to make up her own mind to do it herself.
Best of luck x