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I speak some German (but you should probably run these suggestions by a native speaker!) and my first thoughts are "Feuerchen" (little fire) and "Flämmchen" (little flame). From a quick search on translation sites, "Flämmchen" seems more metaphorical, so might be a good pick. I think it sounds pretty cute too.

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I think you'll generally be after fire-related words with the diminutive -chen suffix. "Fünkchen" for example means "little spark" and is also used in the equivalent expression for "a spark/glimmer of hope".

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Hope this helps :)

Please take this with a grain of salt as I have no knowledge of German language, at worst this is good chance for German speakers to laugh at me ;)

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If you want something literally "little fire," my first thought was "Flammelein," where die Flamme = flame and lein = affectionate diminutive suffix. I am not sure, but I would guess this nickname would have a poetic, maybe flowery or outdated connotation. I did a Google search and only found it in a poetic context: https://lueersen.homedns.org/!gutenb/arnim/wundhorn/wh2050b.htm

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You might also consider a nickname tied to Helen, which has the possible meaning "torch." Ilka, Lena, and Ella are diminutives of either Helen or names etymologically linked to Helen.