Based on the date on the bottom of the page in the first one, she would have been 17, in the second one the date on the cover says 1996, that would make her 14 in the second one, unsure about the third, but I am sure it is somewhere within that same range.
They range from 7-10 years ago, people grow up a lot in that span of time, as well as lose their "Baby Fat", hence the thinner facial structure.