Zhang Yining, two time Olympic Gold winner.
Passionate about TT
In my opinion still the GOAT, not necessarily reflected in number of championships (she won a lot though) but just by the eye test of watching her play in her prime.
She had no weakness whatsoever and the best footwork I have ever seen, man or woman. I do not personally think that any of the women currently playing would beat her in her prime (of course we will never know with some of them).
With that said, though, you could make a really good case for other players being GOAT.
Of course you should check videos of DIng Ning, Liu Shiwen, and the current new generation of great Chinese and Japanese women players.
If you like defenders, check out video of Kim Kyung Ah and Park Mi Young of Korea,
especially when they played doubles together, and even more so against Chinese opponents. Every one of those matches was an epic battle that you will enjoy watching.
I personally learn as much or more by watching women players as watching men. I think maybe more of it translates to things I can actually do.