Answer:
her undeterred devotion to Stephen
Step-by-step explanation:
A static character is one who does not have many personality traits and who is very simple to describe them, because they are not complex and deep, having only one or two striking characteristics. In Rachel's case, we can say that she is a static character, because her only personality trait is her devotion to Stephen. This is a very important feature of the story, but it is all that Rachel has to offer.