My Mother-in-law is a drug addict and also doesn't handle alcohol well. Anyone have any idea how to handle this?

The holidays are coming up and I'm on pins and needles. I know that she expects to be invited out to dinner with us, but I don't enjoy her company.....slurred speech, boring, repetitive, doesn't listen.........and, in addition, tends to be rather passive aggressive in her snarky comments. She lives two blocks from us. Anyone have any idea how to deal with this? It seems like when there is any big event, holiday, birthday celebration, etc., she goes out of her way to focus attention on herself and wreck the occasion. I'm so very tired of this. I want to do the right thing, but don't want to be held hostage every holiday. A few times, usually my husbands birthday, she's too "sick" to go out and we bring her a nice dinner she can enjoy at home, but when it comes to her birthday, she's always ready to go. Now she's looking forward to going out on Christmas Eve with us and we really don't want her to come because of her drunken, drugged up behavior...