In February 1983, she's forced by Elizabeth to kill herself by overdosing on her blood pressure medication, lisinopril. As she dies, she reminisces to Elizabeth about her life, including her husband's four years spent away during World War II, and his subsequent loss of religious faith. She reveals that she and her husband were married twice. After they divorced, he married her "nemesis/best friend" Helen. When Helen died, they remarried for another 27 years.
Betty's death is the first death of a non-Soviet-sympathizer that Elizabeth shows remorse for. She initially hesitated to even threaten her, and once she passes, Elizabeth cries.