The downy dunk shouldn't remove the curl, but steaming will. You can put the curl back in with rollers and water (cold for temporary curl, hot for permanent curls).
Personally, I wouldn't steam Lindsey. I haven't had good results with restoring Lindsey's hair; the texture is too different. That's just my experience though, and someone else may have some ideas that will work better for you.
I'm getting ready to do a Sam & a Kirsten to resell. They are in really good condition, so I'm feeling pretty good that their restorations will turn out really well.