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Cal was in the dance episode as well. If background nobodies can get names in later episodes, there's still hope for Swanna Girl. At least there will be if she's in the Master Class episodes, otherwise she's destined to be nameless forever. We had closeups of her and shots focussed entirely on her, and she has two known Pokémon, one of which has a confirmed gender. The least they can do is give her a name to go with all that.
She must have a voice actress. She made some concentration noises in the one where she lost to Millefeui. Somebody had to have made those sounds for her.