7 y/o daughter - daily frustration fits at home & school

[cal3girls]

My daughter is in her third year of school (2nd grade) & we have received the same complaint from each teacher.  She is easily frustrated & subjects or problems which she may have been doing with ease for weeks can, on any given day, become a crisis.  Upon posing a problem (new or old) she will instantaneously cry out "I can't do it!", bury her head in her hands, & either cry, groan, stomp her feet, or throw herself on the floor (yes, even in the middle of her peers in the school room).  We, & the teachers, both agree she is a very bright girl & can do the hardest problems with ease when she isn't disposed to these fits.  Unfortunately, these outbursts seem to be increasing in frequency.  We moved from the U.S. to Europe in Sept 2006 immersing her in a Dutch school adding stress & pressures, and although they have increased recently she's portrayed this behavior from very early in life.  (FYI: She is now fluent, speaking & reading in both languages; the teacher admits better than most natives in her class.)  She has always had a tendency to want to do things perfect the first time and would rather stand at the back of her ballet class to watch the rest of the girls until the third - last class when she could join the dance with perfect choreography.  She is normally happy & pronounced bright & social by most, but anyone who tries to teach her something school related or otherwise will see her shut down followed by some temper tantrum.  Her teachers & parents are finally at their wits end.  We've both tried all spectrums from being overly sweet and understanding to getting angry and forcing her to do the problem.  Neither of these, nor anything in between have unlocked her brain or pulled her back to reason during these daily moments.  

What is this and how can we work her through it?