Doesn't sound anything like malaria. As I remember it, it gives no particular abdominal symptoms but a cyclical extreme fever, which disappears almost as suddently as it appears. By "extreme" I mean very high indeed - the last fever I had before they hit on a treatment that worked my temperature went up to 111F. I was delirious long before then and only know what I was told, but at that point all they're concerned with is getting the temperature down, as regardless of cause it is that which will kill you.

No, she hasn't got malaria. But get her to a doctor with knowledge of tropical diseases anyway.