This means that the speaker is speaking about another that didn't take place, but should have -- a kind of the subjunctive. When the intent is usually to state that it did occur, and to approve of that, then it could be worded as: "She walks the most gracefully" commonly https://hectorkvatc.pointblog.net/corporate-lawyer-in-sindh-things-to-know-before-you-buy-82615408