Jewel is a fighter for the 2nd Massachusetts Militia Regiment, previously a fighter of Jane Whiteholm's group. Currently, it appears that she is under the aliens influence after Hal had a parasite injected in him by Karen through a kiss, and he convinced her to come with him.
Prior to the invasion, Jewel was a junior at a high school in Boston, MA. However, after the aliens invaded, she took up arms along with fellow classmates, attempting to protect the school, which resulted in her brother, Aidan's death. This and her family's death changed her personality and outlook.