Yes, but in 1998 the old scoring system was still in use.
From what I remember, Tishchenko had a very serious injury. Jelić on the other hand simply lost the motivation to play after she got married and gave birth and wanted to spend her time with the family.
Wasn´t she highly "pushed" by her coaching father (Ivan or something) during her career, especially initally? In such case its in line with the experience that affected the likes of some female tennis players such as Jelena Dokic. But I have just some vague recollections in my memory considering Jelic, perhaps its just "out of the blue", correct me if so.