Hey Norma--
I need someone who knows about alcoholics,
Well then you are definietly in the right place!! That describes all of us!
From my experience there is not much more to do than
a. set up the boundary of no contact. which it sounds like you have.
b. refuse to answer the door if she shows up, or plan a getaway that coincides with her "visit" dates.
c. get a restraining order to prevent her from coming within 300 yards (or whatever) of your family. if she defies the restraining order call the cops.
I mean, what other options are there if you do not want to have any contact w/ this person? There are people (alcoholics or not) who refuse to get the message and so all you can do is enforce your boundaries.
I think the harder part is setting/enforcing boundaries without it making YOU upset and angry and crazy. Once you've decided how you will enforce your boundary, if you can "let it go" it will help you maintain your own serenity...because now you have a plan of action. If X happens then I will do Z. End of anxiety.
Good Luck--
B.