Maybe these links will be of interest:
https://www.backyardchickens.com/threads/hermaphrodite-chickens.457592/
https://duckduckgo.com/?t=ffab&q=gynandromorph+chicken&ia=web
Might be the reason, as " Oviduct dysfunction can occur after infections with Escherichia coli or Mycoplasma gallisepticum." As stated in the link: https://www.merckvetmanual.com/poultry/disorders-of-the-reproductive-system/false-layer-in-poultry
But for a start you could weigh her and if she...
You could find out if she is laying by inspecting her vent and feeling the pelvic bones situated on each side of the vent:
https://www.backyardchickens.com/articles/who-is-laying-and-who-is-not-butt-check.73309/