*sigh* This is why I prefer the traditional grading methods. None of this ridiculous wishy-washy opinions weighing on the grade.
Personally, I'd go in and kill her with kindess and concern. "Oh my GOSH, Ms. Teacher! It looks like my daughter is just having a TERRIBLE time in your class! All I've seen are her test and homework scores and those are all 100's (or whatever). What on earth can I do to help fix this situation?" Etc, etc. If she's a normal person, she'll immediately start downplaying this, with the whole "oh, no, she's doing well, she just needs to "blah"... at which point you need to follow up HARD on why, if it's just this ONE thing, are her grades so low?
I doubt you'll get her to change the grades, but hopefully you'll make her realize how ridiculous she's being.
The child's behavior should not be any sort of significant factor, if any, on their GRADES. Most schools have a separate section for behavior on the report card to relay concerns about things like lack of focus.
