Justine was very ill
As Caroline Frankenstein contracted scarlet fever from tending Elizabeth,
so it would appear that Justine contracted it from her but because of her
youth survived. The selflessless of feminine minstration is quietly
underscored. So is the general vulnerablity of human beings, which should
remind the reader that it is this susceptibility to disease and
dissolution that Victor had sought through his researches to ameliorate.