WOW! It's Joan Freeman!
While perusing around the Internet tonight, I found a short Wikipedia entry for actress Joan Freeman, who portrayed "Marilyn Hayes" in 'PIYZ', along with a picture (dated from 2008)! Here's the link:
http://en.wikipedia.org/wiki/Joan_Freeman
The quality of the photo could be much better, but it would seem time has been kind to Ms. Freeman. Hopefully, a better quality picture will surface soon. Enjoy!