HEY ROCK &ROLLERS- Remember "Cynthia Plaster Caster"???

Now that I have your attention, do you know who Judy plaster caster was WITHOUT using the internet search button?? She knew and hung out with many of the original famous Rock and Roll musicians. She did a lot more than just "hang out"??
PS - If you do google it, don't give it away, but you can leave a HINT!!
Treblig