Hi....welcome to the boards!!

And to a mother's fears and frustrations of having to accept this terrible disorder. I am going through similar fears and have found great comfort here amongst other moms and people who have Bipolar helping me through all of this.
What you are experiencing is normal for a mom....all of a sudden our world is thrown upside down...we know something is wrong and the rug is pulled beneath our feet and we are bouncing between our own instincts versus the reality of it all.
The thing is....you are not alone!!! AND Bipolar IS treatable and one of the very few mental illnesses that is.....the worst part of it all is that it is not something we can see or fix as easy as a physical illness.
There is an array of feelings and emotions involved when first given this diagnosis. When our child has a physical illness, such as diabetes or pneumonia....the docs know how to treat it and our family and friends can see it and we get more support because they understand it. However, with Bipolar it isnt quite that simple or easy.....getting the child stabilized does not happen overnight. And what works for one child may not necessarily work for the next. So there is no quick fix....it is a long drawn out process that us moms have the most difficult time accepting because when it comes to our kids we want it to be all better NOW!!
The thing is, you must be your daughter's advocate and do as much research as you can. I felt the same exact way about the meds....thing is you are lucky that your daughter is being treated so early. The sooner she is treated the better off she will be. My daughter ended up being arrested and was putting herself in unsafe situations. You are at an advantage since your daughter is young enough to teach and to learn how to accept this as part of her life and live a fairly normal life.
There are tons of books out there for both you and your daughter to understand all of this. Take a trip to your library...knowledge is power and the more you learn about Bipolar the more power you have to help your daughter. "The Bipolar Child" by Demitri Papolos is a great start.
YOu must remember that all meds have side effects...unfortunately the ones for Bipolar have more but I keep in mind what the pyschiatrist told me, that an unmedicated child is at a far worse risk than a medicated one.
Take a deep breath and know that there are many out there walking in simialr shoes. Visit the Bipolar Forum here.....there are a bunch of other parents feeling very similar to you....some are a little bit ahead of you like myself who can help you along the way. IT isn't a fun journey but knowing that you are not alone sure makes it less scary and easier to travel.
(((HUGS))) from one mom to another ~ Goody