My female zebra just hatched three of four eggs a little over two weeks ago. I had the same concern but what I have learned is that she may not sit continually until her clutch is complete. May be anywhere from three to seven eggs. When she is done laying she should incubate and the eggs should hatch. The advice i give to you is what i have learned here on the site...it is best to just leave her be and she will do the rest. Xebras are pretty good parents...and all you should really do is feed her fresh greens and egg food. That is what was told to me and it worked. NATURE will do the rest. Good Luck!!!!