Maybe try something like this:
Originally Posted by
AlcSis 
I hate to place the blame on you for my health beginning to fail.
And I hate to bring up the fact that your drinking in the past caused great personality changes and that booze makes you mean. And that although I have forgiven you; I have not forgotten your actions.
I have much to lose; my health, sanity and possibly my living situation - which is comfortable, not fancy, but comes with many restrictions. I would hate to have my sense of peace and secured living situation jeopardized.
I just I copied and pasted what you wrote. My changes are in bold.
Yes, I agree that you probably shouldn't call her an alcoholic to her face. Why go there. It doesn't matter what she's called, the problem is how she acts.
Good Luck to you. You will be in my thoughts and prayers. I have some very strong willed brothers and sisters as well. It can be very hard to break patterns of communication with family members.
(((((((( hugs )))))))))