Is it illegal in Washington State to open an account in another person's name without their permission?

Suspect X opened a cable account in her granddaughter's name, using the granddaughter's social security number, but without the granddaughter's permission or knowledge. Granddaughter is 17 and lives in another state. Suspect X did not intend to defraud the cable company. Suspect X has been paying the bills on time so far. What statute, if any (state or federal), makes Suspect X's actions a crime?