That sounds just like my son! He's very high energy, very curious, and eager to learn. (That's the nice way to put it.) Your daughter has a very inquisitive nature, and she is learning more about her environment than the kids who sit obediently in someone's lap. My son is 3 now and he's even more active. I put him in gymnastics class to help challenge him physically, and he loves it. You may need to find some kids for your daughter to play with who are more evenly matched. Maybe even older kids. My son gets the most enjoyment from playing with a set of twins who are 2 years older than him, and they're the only ones who can wear him out! Good luck.
Edit: Please don't consider ADD at this point. I recently learned that ADD can't be accurately diagnosed till about 1st grade. All toddlers are ADD by definition, it's just part of their development. Don't discourage your daughter from being active, embrace it!