my vote is normal too. Even the verbal ones don't always understand exactly what they are saying. Sometimes it's like this phrase goes out in this situation. Words are new. Go back to physical actions which are concrete.
This is a great time to learn to be playful. There's a book called Playful Parenting, but the concept is that simple. The book gives you ideas, however, having just a few "tricks" to change a situation to an inviting one goes a looong way. Have whatever she doesn't want to do talk to her. NOT like in a poor me, feel sorry for me and do this kind of way, but a Hey! this is FUN. I'm doing it wrong - how is that again? Or singing. Or funny noises. Change the tone and magic happens.
Another thing is for YOU to take possession of it. "I" am going to put on this boot. Then you hear "No! It's my boot!" Also watch to see if her dexterity is developed enough, or if you can break it down into smaller steps. Maybe it's just an excuse for more of mommy's love and attention. After all, who doesn't love being spoiled now and then? In that case, I'd just rephrase her comment to "would you do it mommy?" so that she learns to say something else that explains herself better.