Charlotte's last name is Porter, which means she did not keep her husband's name - Sommers - after the divorce, but her daughter's legal name would still be Jordan Sommers and not Jordan Porter as was shown several times when Bonnie sabotaged her chance for the STEM Program at the school.
In the article Bonnie pulls up on the computer about Charlotte and her ex-husband, there is a misspelling that occurs twice: "wired fraud" instead of the correct term - "wire fraud".