Yes! It's crazy, the whole strong will thing, especially lately.
She's been pretty sick this last week, dd2y11months had a touch of pneumonia and the bossing just got way worse, also the obsessive side got really bad too: really needs to have certain things when she wants them "NOW!", if she decides her shirt is wet it has to come off "NOW!" and so forth.
I feel really bad about this, but when she flat out refused to take her medicine (kicking/screaming) - I had to discuss the fact that she would get really really sick and might even die. She stared at me for a couple of minutes and then finally drank it up. Since then she's been taking it ok. (I am still waiting for that one to backfire on me...)
Now on antibiotics it is such a relief to see her returning to her 'normal' level of bossing us around, often with a smile, at least.