Mrs. Clark is a twenty-eight year-old-woman, who is the daughter of a minsister. Although that may cause conflict on the island, due to opposing views; she is a college graduate, and an electronics engineer. Obviously, an island wouldn't have a lot of available electronics, but she does know valuable information.
Also, if Mrs. Clark is dedicated enough to go into an extremely difficult major, then she is hardworking and will be willing to work on the island. Not to mention, she is single after a brief marriage, and would hopefully be able to have a relationship with someone else on the island. Ultimately, causing possible children - to make the population continue.