When does a minor girl lose her right to annul her marriage through mi'un?
Halachah 4 states that a girl may exercise mi'un throughout the time she is a minor, until she becomes a na'arah.
Question 2
How many witnesses are required for a valid act of mi'un, and what must the girl say?
Halachah 8 states that she tells two witnesses 'I no longer desire my husband so and so,' and this constitutes valid mi'un.
Question 3
What is the legal status of a girl who annuls her marriage through mi'un with respect to her husband's relatives?
Halachah 16 states that a girl who leaves via mi'un is not considered divorced — she may marry his relatives, he may marry her relatives, and she is not disqualified from the priesthood.
Question 4
From what day does the 90-day waiting period begin to be counted for a divorced woman?
Halachah 19 rules that we count from the day the get is written, even when written conditionally or when it did not reach the woman until years afterwards.
Question 5
For how long is a nursing mother restricted from remarrying, and what happens if her child dies during this period?
Halachah 26 establishes the nursing restriction at 24 months. Halachah 27 rules that if her son dies during this period, she is immediately permitted to marry.