Love it! Love her - both as Calamity, and Doris the person. Also Howard Keel, and the other two main characters. For sure, it wouldn't fly today - but it was of it's time, and even then represented an earlier time.
I know all the songs back to front and sing the Deadwood Stage when riding the local hills (on my bike now, but years ago, I sang Secret Love whilst on a horse, just like Calam). I think she looks perfect when she is dressed for that scene, not too fancy, and certainly not too mannish.
I worked hotel reception maaaany years ago, and a group of people cam to stay who were not English. They spent quite some time trying to tell me who they though I resembled, and it was Doris Day!! (I wish) However, I also volunteered at an animal sanctuary where we had a very large pig named Doris, so when the nickname stuck, I was never quite sure which Doris I actually resembled.