If you are in Texas, I would wait and skip her to fourth, not third. Third is a really hectic, crazy, year there preparing for their first TAKS test - unless the school is set up to be quite different.
If a child is ahead and there is no really wonderful GT or advanced program, it would just be test prep, test prep, and more test prep.
I am not sure where you are, but this is the case. Second grade is very flexible; third is just nuts. Fourth is constant writing and the students have to be ready to write very well because that takes up quite a bit of their time. We loved fourth grade. We also had a very good advanced program at our school in third - although it was very hectic and stressful.
For second graders, there are more allowances, but once the administrators see third grade, the worry is that the student knows how to pick a multiple choice question correctly.
The strange thing is that the exceptionally bright students (which our school had quite a few of) were the most stressed about this. The students who should have been stressed really were not worried and did not pick up on it. Of course, the really bright kids did not miss any questions on the exam and probably were never going to do so.
