L.,
I would definitely bring it up to her teacher, but in my experience, they do nothing about it. I was told from Kindergarden to now this far into 3rd grade that it is just a phase. When is the phase going to end? That they have no answer for. I have gotten her tested for ADHD since she is now acting out in school, and the psychologists cannot believe the school will not do testing, as she is plenty old enough now.
I am sure you will be met with she is not old enough for the testing, wait until the end of 3rd grade, and if your concerns are still there, we will assess it then. Well that should not be good enough. My daughter is at 2nd grade level for reading and spelling. She was proficient in math until this year, but now is failing. Put your request in writing and give it to the teacher, then keep on them to find out why your daughter is doing this, so you are not in my boat in 3 years.
Good Luck!
H.