Hi L. C,
OMG - I could have written word for word what you have described (same grade, daughter w/ADD, stopping it and not telling teacher, then having teacher call etc. WOW!!).
My daughter has never taken Ritalin, however she takes Metadate CD (it is in the Ritalin family), it is in a capsule form (little balls inside), and I separate the capsule and put the balls in whipped cream - it is the ONLY way my daughter will take it. My neuro said to put it in applesauce however my daughter will not eat applesauce.
One of my daughters teachers told me that there is an ADD drug that is available as a patch, maybe you can ask your daughters doctor about that. Is your doctor willing to try a different med? I know that some doctors don't like to try different meds because it takes time to tweak the medicine and find the perfect dose.
I'm not sure if your pediatrican is prescribing the medicine or a neurologist. I highly recommend the neurologists at Children's Hospital to manage your daughters ADD and meds. If you don't already go there, I know it may seem daunting going into Boston but they are fantastic and have so many resources to help you.
Best of luck, and know there are other moms going through the same thing (I know it doesn't seem that way when you are in the throws of battle with your child before school). Hugs to you - hang in there!