Oh man I'm a bit sad I missed the D&D world, a class/race swap for Keyleth would have been so entertaining, but that sounds incredible.
She will add a lovely little floral flair to it for sure!! I know Plant Growth doesn't usually let her have any actual control over what grows and in what shape but since most of her spells are more intended for combat we can add some homebrew flair to it (also who knows, maybe this dimension they're in has a weird effect on her magic??)