Bathing within thirty days for a postpartum woman for the brit

A woman within thirty days of mourning gave birth to a son. Is she allowed to bathe in hot water, wear Shabbat clothes, and eat at the brit?

A postpartum woman is allowed to bathe as usual even within the seven days, and she is permitted to wear Shabbat clothes for the brit. According to Sephardic custom, she is allowed to eat at the brit, while according to Ashkenazic custom, eating is prohibited.

Regarding bathing for a postpartum woman, it is explained in Shulchan Aruch, Siman 581, Paragraph 3. Regarding wearing Shabbat clothes, it is explained in Rema, Siman 391, Paragraph 2, that the father of the child is allowed to wear Shabbat clothes, and in Mishnah Berurah, Siman 559, Subparagraph 32, it is written that the law for the mother of the child is the same as for the father, regarding Tisha B'Av, and even more so regarding mourning. Regarding eating, it is explained there in Beit Yosef, Siman 391, that it is permissible, and in Rema, there, Paragraph 2, it is written that it is forbidden, and Taz, Subparagraph 3, ruled to differentiate between mourning for one's father and mother, which is forbidden according to Rema's custom, and mourning for other relatives, which is permitted. However, the opinion of our teacher is that one should not rule like Taz in this matter.