Question: has there ever been a female black panther

Answer: Yes, Prince Namor of Atlantis attempts to recruit T'Challa for the Cabal, a secret council of supervillains run by Doctor Doom. He rejects the offer but is attacked by the various members, and is left in a comatose state. Queen Ororo nominates Shuri as his successor, and she successfully completes the various trials, granting herself access to the heart-shaped herb. However, when she consumes the herb, the Wakandan Panther God does not imbue her with the powers of the Black Panther, instead rejecting her due to her lifelong jealousy of her brother's mantle and her arrogance in its presence. When the powerful villain Morlun threatens to annihilate Wakanda entirely, Shuri takes on the Black Panther identity and outfit anyway, and manages to both save Wakanda and resurrect her comatose brother. Through her humble act of self-sacrifice she earns the mantle of the Black Panther, and the Panther God grants her its accompanying powers.