I picture Rosalind more as the fairy-like, delicate, and pale rose-gold, but I can understand the other image. The nn Roz definitely sounds like the chain-smoking, frizz-haired floozy. I love Lindy as a nn. It emphasizes the pretty and delicate side of the name.
Yes, I like Lindy as well, more than Roz. I also like Rosy (the Y ending keeps that fairylike feel more than the -ie ending I think), and mostly as an affectionate pet name, Raspberry.