Kitāb al-Anwār wa'l-Marāqib: Discourse V · Ch. 9: Whether a woman may circumcise or not?

اما الربانيون فانهم لا يجيزون ذلك وجماعة من أصحابنا يجيزونه واستدل بنيامين على جوازه بقول الكتاب [שמות ד' כ"ה] ותקח צפורה צור ותכרת את ערלת בנה وهذا عندي ليس بدليل اذ كان لم يكن هناك أحد يفعل ذلك غيرها غير انه اذا كان ذلك فرضا لم يحرم ان تفعله امرأة اذ كان الكتاب لم يحرم ذلك ولا خصه برجل دون امرأة الا أن يتعلق متعلق بالإجماع فيكون القول فيه مشتبها.

The Rabbanites do not permit this, while some of our companions permit it. And Binyamin proves the permissibility of this from the verse (Exodus 4:25) “Then Zipporah took a flint, and cut off the foreskin of her son, and cast it at his feet; and she said: 'Surely a bridegroom of blood art thou to me.'” And this verse, in my view, is not proof since there was nobody other than her to do it. However, if it is the case that circumcision is a commandment in which it is not forbidden if done by a woman since the Torah does not forbid this and does not specify circumcision by a man and not a woman, but rather this issue is dependent on consensus, the ruling is doubtful.