Hmm... nonetheless, perhaps it might be possible, somehow to find out where the real JMB was working in the early 70s and if she was involved in troubled teens then.
The obituary actually says:
"Mrs. Bromke was a registered nurse at the Alternative School Inc. in Cherry Hill. She was a 1968 graduate of the Helene Fuld School of Nursing in Camden. Survivors: her husband, Bruno J. of Bellmawr; two daughters, Janice and Cheryl Annboth of Bellmawr, and two sisters, Judy Sebastian and Dianne Sieck"
Wait crap... we may now have a fourth Janice Bromke: our 1973 deceased, our 1991 deceased, our 1991 deceased's sister-in-law (now unaccounted for but too old to be our UID) and our 1991 deceased's daughter.
The school moved to a former elementary school.
"The Stafford School's current tenant is the Alternative School Inc., a private, nonprofit junior high and high school for emotionally disturbed young people"
I can't find much else than that just yet, but there may be more opportunity for research here.
What this does also mean is that we could yet have somewhere to go with the idea that the deceased runaway was using her real name. It's still unlikely, but she could be 10 or more years younger than her brother, and we no longer have a confirmed obituary for the daughter of the NJ family.