To what extent is it permissible, from a religious standpoint, to include women in the Shura Council responsible for managing the finances of a mosque that relies on donations in Western countries?

It is permissible to consult wise women of sound judgment and to adopt their correct opinions, provided that Islamic guidelines are adhered to when interacting with men and mixing with them. This is evidenced by the Prophet's (peace be upon him) consultation with Umm Salamah (may Allah be pleased with her) at Hudaybiyyah, the righteous man's consultation with his daughter regarding the hiring of Moses (peace be upon him), the Prophet's (peace be upon him) consideration of the opinion of Umm Atiyyah and her companions regarding the washing of his daughter Zaynab, and Abdur-Rahman ibn Awf's consultation with Umar and Hafsa on various matters. When consulting women, one must adhere to the Shari'ah and avoid anything that leads to suspicion and evil. The default is for a woman to remain in her home and for conversation with her to be from behind a veil, without speaking in a soft manner, as Allah Almighty says: "Then do not be soft in speech, lest he in whose heart is disease should covet, but speak with appropriate words. And abide in your houses," and Allah Almighty says: "And when you ask [his wives] for something, ask them from behind a partition. That is purer for your hearts and their hearts." It is permissible for men and women to sit together for consultation in one hall, provided that women adhere to modest dress and men lower their gaze. However, it is preferable to ask women for their opinions through their husbands or maharim.