Talk to her. She's old enough to understand pretty everything you say. Tell her what you are about to do with everything. If you are going somewhere say "do you want to get in your car seat and go bye bye? You have to sit in your seat if you want to go to the store". If she's poopy be silly with her and say to her "ooooo, you stink! Let's change that diaper. Stink, stink, stink". I have to be extra silly with my son to get him to be still sometimes. Just remember you are the adult. Don't force her to do something, convince her that she wants to do it. Make it seem like it's her idea. Are you ready to brush your teeth? Then let her start, and you finish. Or let her brush her own teeth for a week or two alone. As long as she isn't eating candy, which she shouldn't be at two, it won't hurt if they aren't perfectly cleaned for a week or two. Let her have a little control over a few things, but gently make sure she knows you still have the final say. This is the sort of thing that worked for my older 2, and continues to work for my 20 month old.