Perhaps the cheetah felt a little worried or threatened if the woman tried to get a bit too close. I doubt they would ever attack maliciously.
I still find it difficult to believe...
I've always thought of Cheetahs as timid, nervous creatures- at least where it comes to humans- more like temperament of the smaller cat species. If this was a 'tame'cheetah as appears to be the case, I'd have thought it wouldn't have objected however close she was, I've seen photos of people fondling tame cheetahs like domestic dogs. Still, they ARE wild animals.