DS1 wore a sleeping bag until he was just over 2, he stopped wearing it once he could keep the blankets on top of him. I don't have any tips on how to wean your DD off them because it was a bit of a non-event for us LOL!

While you still have her in one, is there something you can give her to distract her while you're putting it on? DS2 gets really wriggly too so I give him his toothbrush and it entertains him enough so that I can get his sleeping bag on without much fuss. As for working out how to undo the zip, she's very clever! You can buy sleeping bags that do up from the top so that the zip is down the bottom when it's on IYKWIM, I have one that I bought from Baby Bunting.

Good luck