Oh the unplanned twists and turns of life! If it is a pullet would be easier to keep it, at least for me, you could pick and chose when to set eggs. Some people specifically look for showgirls so you could test the waters in your area to see if people are wanting them. Or sell the hatching eggs from her but not set them yourself.
I'll tease you about keeping your showgirl, but honestly I'm planning on selling any showgirls if I hatch them

but what if it's my only black pullet!?! Argh, then I'd need to keep it! Oh no, here I go... the descent into owning a showgirl