J.N.
Aside from the terrible two's, also consider that her life has suddenly been turned upside down. Think about it, you are in between homes, so her familiar and comfortable surroundings are no more, there are extra people present (even if they are grandma and grandpa) and I'm certain that some of her daily routines have changed a little bit. Additionaly, I'm sure that there is a certain amount of anxiety or nervousness on your part while waiting for your paperwork to clear and for your new life to start, all of which your dauther can pick up on.
At this age, she's stil learning how to fine-tune the way she expresses her emotions and many times it may just degenerate to tantrums out of frustration. My girlfriend's son had the same types of problems with meltdowns of thermonuclear proportions around this age when they had moved into a new home and then a week later had grandparents come and stay for a month (they're from out-of-country).
You may find this article to be of some help (http://www.babycenter.com/0_tantrums_11569.bc), but please also consider consulting with your pediatrician if you are really concerned about her hurting herself. Take heart, stay strong and it will pass.
Best of luck!