When my siamese Sarah gave birth she really wanted to be alone. When my mother or I would come in to the room she would actually stop pushing. We watched her give birth through a crack in the door. I have heard of cats that really want their owners to be with them. I think that it depends on personality. Sarah has never been an affectionate cat. I dont know why? I got her from her breeder the day she turned 8 weeks and she is the best mother any breeder could ask for. Yet my other siamese Rachel is very affectionate and very loving, but we did not get her until she was 16 weeks old.
So in response to your question, I would leave her alone, but still keep an eye on her.