1. She's a horrible person. You'd think this wouldn't be hard to remember - it's in her name! - but it's hard to resist the urge to soften her up a little, make her a little more sympathetic, because it's painful to read (or write) about a thoroughly horrible person.

2. Part of the reason she's such a horrible person is that she really doesn't get other people. She tries to control them through threats, blackmail and bribery because she doesn't have the social skills to create any more functional relationship.

This makes her, if not sympathetic, understandable, which obviates any desire to soften her up.

3. She's a monomaniac. Her obsession of the moment should be mentioned early and often.