I never got it either. Then sometime in the late seventies I happened to catch The Prince and the Showgirl (with Laurence Olivier), on late night TV. She was actually very talented, and from most accounts a very likable person. For the most part, those are the reasons I've heard more than others from her co workers.
I've always thought of her as rather plain looking, and never liked the bleach blonde hair.
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...