I guess you document what happens with the medication and see which ones help, and which ones make it worse. Eventually, you will get a combination that works and then she will be stable and do well for awhile. As she grows and her brain develops, the medications will need to be adjusted.
You need to treat the symptoms and enjoy the times she is stable. Cognitive behavioral therapy might be helpful, since she seems to have an understanding that something is wrong and is still acting like a easy child. She will probably be more open to it then a typical difficult child.
Read some books. Kay Jamison wrote an unquiet mind. She has bipolar, but she is a psychiatrist. People can do well.