H.W.
Hi Sam,
Eek! I typed up a great resource, however, your daughter is not at an age where she's misbehaving, per se. What was the meltdown over?
You might consider checking out "Raising Your Spirited Child" by Mary Sheedy Kurcinka. I have nannied a few strong willed children-- it was truly difficult when they were little and had less control over their world. Gaining the ability to verbally express herself will help, as well getting older. My 'spirited' charges are all doing VERY well academically, by the way (one got a full scholarship to Pomona to study biology)... these kids can be super tough, but I've noticed that they are also pretty motivated to do what they set out to do, and that is a very good thing.
I would also suggest "How to talk so Kids will Listen....and How to Listen so Kids Will Talk" by Faber and Mazlish, for when she is older and will want to be part of the problem-solving process. (this book is a classic on interpersonal communication, by the way.)