I believe the contributors here who testify they heard her say it was a phone call. That's not hearsay. They are witnesses of an event (her speaking).
I am far more skeptical of "I read it somewhere that she said x or y." I read lots, as do most of all y'all, and I know how things I read get mushed and jumbled around in my brain after awhile.
I would accept someone remembering a distinct time when she said it was only a "What Would Martin Want?" hypothetical question in her mind. Anybody distinctly remember her saying that? Or a print citation? This is fun. I feel like Columbo.