Not asking any yes/no questions for ten or fifteen minutes usually worked for me. I’m sure you know that little children at some point figure out that they are smaller than us, and that they are pretty much at our mercy (this depends on one’s perspective, of course…). They have one move when they don’t want to feel powerless. It sounds like “No.” What it really means is, “MAKE ME!”
So don’t try to make her do anything for a few minutes. Mine always forgot they weren’t going to do anything I wanted them to do, and became much more pliable, when I just went on with my life like I didn’t give a rip what they were doing.
(Just FYI: in case the “no!” involves a necessary car ride…this tactic initially required me to physically head out to the car as if they didn’t exist, and sit in it until they lifted their heads out of the toy box and realized I was gone. It took about a millisecond for them to realize they didn’t REALLY want to not go with me. :)
Yes, I’m evil. But that only had to happen once.)