Is it permissible to give zakat to needy siblings for marriage? Can this be repeated annually until the amount is complete? And is it permissible to keep the money for them and pay zakat on it?

It appears from the question that the intent is: Is it permissible for a woman to lead other women in Tarawih prayer? The answer is that this is permissible according to the preponderant view among scholars, on condition that she stands in their midst and does not precede them, based on the hadith of Umm Waraqa (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) commanded her to lead the people of her household in prayer. Narrated by Abu Dawud.

The preponderant view among scholars is the permissibility of a woman leading other women in Tarawih prayer, on condition that she stands in their midst. They cited as evidence the hadith of Umm Waraqa, in which the Prophet (peace and blessings be upon him) commanded her to lead the people of her household in prayer.