C.B.
I find that instead of giving "yes or no" options, if you give her "this or that" options, it takes away a lot of the battles because it gives her some control over her situation. So instead of telling her to get dressed (which gives her the option of either "yes" and staying and doing what you want or "no" and running away), try holding up two outfits and ask her which one she wants to put on. Then she still gets to make a decision, but instead of deciding whether to run or stay, she gets to decide which outfit to wear. I've found with my own kids that if you let them feel empowered in some situations, they're less likely to fight every decision you try to make for them. Also, look for times when she does do what you ask, and gush all over her...at 2 1/2, she'd probably get super excited about getting a sticker or anything small like that. And when you want her to do something like brush her hair and she doesn't, you could say "I guess I get to keep the sticker for myself this time because I brushed my hair"...that might bug her enough to push her into action...lol.