Welcome (((lab)))
That fear of the unknown is a killer...sometimes more difficult than knowing just what you're dealing with.
I have to ask though...does it really matter?
The behavior you describe is unacceptable reagrdless of the reason. As a matter of fact, learning she's an addict might actually explain the behavior.
Or, she may just feel it's OK to walk all over you.
Is either really acceptable?
Just a thought
(((Hugs)))