If your sim hasn't already turned into a mummy then you can just stop her from sleeping in it. But, if she is already a mummy, if you have a fetish about cheats, Egypt is probably where your going to be going a lot. Or you could just use buydebug and sleep in the blessed sarcouphagus of kings. I don't think I spelled that right. Also, I don't know what happens to pregnant sims if they turn into a mummy. Your sim might be immune to it because the pregnant sims can't starve even with the use of cheats. They can't seem to get it into their head that they are supposed to burn either. So, it might work the same way with the mummies. But I wouldn't take risks. Well, is it a legacy or a normal game? Either one you could just turn her back and then have her get pregnant again...