Relax, im having trouble with her too. I can almost beat her. The trick is to be fast enough to get as many trozeis in trozei chance, also, if youre fast enough, when she uses the boulders push them aside as soon as they enter. Also, try and get a four as fast you can or when the timer starts. Dont forget, you can still create a trozei before the timer finishes.
I really havent beaten her yet, but i plan on doing so in a few minutes. Try and go as fast as you can. That's my best advice for this one.
Edit: beat her. You need speed, youre best asset for this is speed.