I'm sorry you are suffering as well. I understand I have a 14 yr old son who has PDD. He goes through these "rage cycles" I dont see the depression side just hyped up anger always at the end of the day like the "witching hour" time when they were babies. So since I have the bipolar I am sure the pdoc has thought about it but they dont want to label them.
And all medications have their honeymoon effect, then they sort of wear off so it might be she needs some tweeking with the meds... good luck