Eh asking the question was not the point, asking the question while swearing to your parent, thats very rude.....especially at 13.
Because she was frustrated? Even if it was rude, considering it's been 13 years, it was probably the only way to ask that question. Add to the fact that Sakura can destroy entire buildings in a single blow, she should know to keep her anger in check most of the time. Well she doesn't that is the joke...but it's nice to see that joke taken to the logical conclusion.
(Not everything can be fixed as easily as Naruto or Sai can...)