Yeah, she'll be thin cos alcoholics like this don't eat much. No appetite. They will become apathetic in other ways too and not clean or dress themselves much - that's probably one of the first signs you'll get that she's gone down a notch.
ARBD patients don't have empathy; the brain damage ate the bit of of the brain where it lives. This will cause you a world of pain.
OP, this is a disgusting disease for you and your family - DM won't know there's anything wrong with her. But it's hard to get carers for people who are so, er, challenging, and you can't do it yourself.
You'll expect to see DM's balance going, so she'll need a wheelchair, and her muscles will waste from inactivity and paralysis so she'll need moving equipment at home - hoists, etc. Some people don't get liver failure, but the dementia will keep destroying her brain and it will kill her if she doesn't stop drinking.
The good news is that at some point she'll forget she's an alcoholic and she might plateau at that stage, but she'll still need 24/7 care. Brains and limbs don't grow back.