DD 2.5 will only wear what she wants to and has certain things her way in order for her not to throw a mega tanty! My friends DD 2.5 sounds very similar to yours but in relation to getting int he car to go anywhere. She has to do it herself and if she thinks you have touched her in any stage of the process she will have to back and start again so the process of leaving the house can sometimes take up to 30min - not fun when she has to get DD5 to school!!

It sounds like fairly typical behavior for her age but if it doesn't improve as she gets older then I would definitely look into it further.