Early in her career, Johnson was busy in radio. "By 1936 she... was appearing in ten radio shows a week."[5] She played the leading role in Joyce Jordan, M.D..[7]
In an incident that was never fully explained, Johnson suffered a head trauma on September 6, 1948 that required brain surgery.[9] Unsubstantiated rumors promulgated by gossip columnists such as Walter Winchell suggested she might have been abused by a boyfriend, but the only explanation she offered was that a large, industrial-grade hair dryer at her apartment had fallen on her.[5] She was in a coma for two weeks and it was reported, "It took her a year to recover. Her left side was paralyzed temporarily, and for a while she couldn't walk."[10] It put a virtual halt to her film career. Her screen time in movies after that was limited due to her reduced mobility and powers of concentration.
^"Lux Theatre Guest". Harrisburg Telegraph. Harrisburg Telegraph. Harrisburg Telegraph. June 5, 1943. p. 17. Retrieved December 23, 2015 – via Newspapers.com.
^Kirby, Walter (December 21, 1952). "Better Radio Programs for the Week". The Decatur Daily Review. The Decatur Daily Review. p. 44. Retrieved June 8, 2015 – via Newspapers.com.