There's nothing that says you have to tolerate outright RUDENESS or DISRESPECT as she goes thru withdrawal. Moodiness, yes; rudeness and disrespect, no.
The next time she ignores you, I would say "Look, I know you're angry with me now, but I don't appreciate being ignored. You don't have to carry on a conversation with me if you don't want to, but I'd appreciate a direct answer to a direct question."
Or something like that.
I had to do that with my wife. She would then say "Oh, I an more than 'angry' with you -- I AM LIVID." And I'd say "I get that. If I were in your shoes, I'd be pissed at me, too. But it doesn't give you the right to be rude to the family."
