Frankie started modeling around 1990. Both Angela and Frankie had busy careers, but Angela's career remain busy while Frankie kinda disappears from time to time.
I also thought Frankie appeared around 1997,98 alongside Carmen,Gisele and the rest of the models of that time, but then I discovered her early work, which dated 1992,93, but then i found a pic with her and Helmut Lang from 1990, which means she started at around that time. Models always start at least 2 or 3 years before they become recognized faces...the models of today are much happier, cause they can become stars the first season they appear.
Frankie had longer career than Angela, but Angela somehow manages to keep up.
I guess Frankie has many other priorities in her life.