I have read Sunni as well as Shia books for the reference and confused that how many daughters our prophet actually have?

If have four daughters as per Hadith then it raise following points.

1. Why did Holy Prophet PBUH took only one daughter in Mubahila event against christians while Allah ask in a plural way. Come lets bring your sons and our sons, your females and our females.
2. Why only one daughter is the leader of all females in heaven? Isn't it injustice with other daughters and Prophet can never do injustice.
3. Why only one daughter's children called Aulad e Rasool?