Some kids are just very emotional. My two nieces are. One will cry at the smallest things with deep heartfelt sadness. The other bursts into angry fits very easily (getting better now that she's 4 though). I've watched since they were tiny and I think it's temperament. Mom has tried many different things, but all we can seem to do is teach them to handle these intense emotions in a more positive way. They just seem to react very strongly to things, by nature.

I think the best thing is just to re-direct and teach appropriate reactions. Hopefully over time she will learn to moderate her emotional reactions. Some girls can be emotionally more intense, but I think it's temperament more than gender.