Let’s see—although this might be more the realm of the potager, consider Pleurotus_eryngii, which your heroine would know as pleurote du panicault, or perhaps argouane, bérigoule or girboulot:
In English, it’s known variously as king oyster mushroom, king trumpet mushroom, French horn mushroom, eryngi, king brown mushroom, boletus of the steppes, trumpet royale, or aliʻi oyster—-and can look downright salacious when the cap is young and small:
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https://fr.wikipedia.org/wiki/Pleurotus_eryngii
In English, it’s known variously as king oyster mushroom, king trumpet mushroom, French horn mushroom, eryngi, king brown mushroom, boletus of the steppes, trumpet royale, or aliʻi oyster—-and can look downright salacious when the cap is young and small: