H.P.
I know it can be frustrating, but it's actually pretty typical 1 year old behavior. Both my girls were the same way-- the leg clinging/crying when you leave the room business is separation anxiety. She wants more attention from you. The squiggling out of diaper changes and dressing struggles are VERY common of this age and very typical. She'll eventually settle down. Just try to get her dressed quickly and if you need help holding her down, solicit help from other family members. It's not her getting "lazy," it's a stage of development she's going through... they all do it. Hang in there, know that it's pretty typical, get through it the best you can and then be ready for the terrible-2's and the even-worse-3's!! :)