Daughter's Dilema

As many of you know, our daughter is being married this August.
She is really struggling as she is the last to carry her Dad's name
and she is not sure she wants to take her fiance's name. I think
she feels it would be a tribute to her Beloved Dad to keep our last
name. Of course I have the same last name, but not the same.
She may use both names with a hyphen. PLUS she is a high school
teacher and she is known by her birth name, BUT should they have
children, what name would they take..............suggestions please
this is really tearing her up.