The superlative is most gracefully.
Almost all adverbs that are not also adjectives (e.g. fast, high), and all that end in -LY, form the comparative and superlative using the words "more" and "most."
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No. Graceful is an adjective. The adverb form is gracefully.
Yes, gracefully is an adverb, from the adjective graceful.
Yes, it can be. Worst can be a superlative adjective or a superlative adverb (meaning most badly).
Smoothest is the superlative form of the word smooth. The comparative form is smoother.
No, it is an adjective. The adverb form is beneficially.