Sheeeze, give her an C on grammatical stuff, and let her speak in her hearing..
If she is as dumb as a box of rocks as you English teachers say, she'll get the ole heave-hoe anyway, whats wrong with that? Then you will get an A for catching it soooooo soon.. I'll present it myself.. :)
If she can't stand the heat, she should get out of the kitchen. She is missing a few ingredients and is a recipe for disaster. Cheers,