Not sure if this is the interview you had in mind, but I enjoyed this --Do you have a link to the interview, it sounds very interesting, I'd love to read it!
https://www.startrek.com/article/catching-up-with-diana-muldaur-part-1
There's also a Part II.
Amazed at how "Is there in truth no beauty" was filmed.
Did not know her birthday is the same day as Roddenberry and Frakes.
The story about her Star Trek cruise was also new to me.