Is it permissible for a married, pregnant woman who practices masturbation due to a lack of sexual satisfaction from her husband, and this habit affects her prayers and life, to undergo a clitoridectomy to stop this forbidden act? And are there any foods or medicines that reduce this desire?

Masturbation is not permissible due to its negative effects.

A wife has the right to conjugal relations with her husband according to what is good and proper. If your husband falls short in this, discuss it with him.

Regarding circumcision, foods, and medications that affect sexual desire, consult specialized female doctors.