What is the solution for someone who suffers from obsessive thoughts and doubts about religion, such as her questions about why a female slave is freed upon giving birth to a son but not a daughter, a man's right to strike his wife, the Prophet's saying about a woman prostrating to her husband, the preference of men over women despite women's suffering in childbirth and upbringing, and the existence of Houris for men?

Ignorance of Allah, His religion, and the rulings of His Law leads one into doubts. The correct beginning is to know Allah and His attributes, to perfect His creation, and to solidify His law. Justice is treating every being as befits it, not equating dissimilar things.

As for the specific parts of the question:

1. Emancipation of Umm Walad (Mother of a Child): The statement that a female slave is not emancipated unless she gives birth to a male child is incorrect. A female slave becomes Umm Walad and is emancipated simply by giving birth to a child from her master, whether the child is male or female, or even a stillborn fetus. The word "walad" (child) in Islamic law includes both male and female.

2. Striking a Woman: The default rule is prohibition, and it is permissible only in cases of nushuz (rebellion/disobedience) with specific Sharia-compliant conditions, though it is preferable to avoid it. If a man exceeds the limits in striking his wife, she may seek retribution from him, even with his right of qawamah (guardianship/headship).

Advice for the Believer: A believer must safeguard their faith from doubt and strive to seek religious knowledge, or avoid exposure to doubts, especially if they suffer from obsessive thoughts.