Nice find. It is a shame, that Jacinda Ardern didn't make the list. I am a german and value her over Merkel. Apparently Margaret Thatcher is forgotten now. And as someone with scientific interest I take offense at the omission of Marie Curie.
Concerning Margaret Thatcher and Marie Curie, those two are obviously both dead, as Ka-pi96 mentioned, so I think that's one reason they didn't make the list of most admired women. But yeah, there's definitely more than just one popular and successful female head of state out there, you're right. In addition to Jacinda Ardern of New Zealand, Mette Frederiksen of Denmark, Tsai Ing Wen of Taiwan, Sheikh Hasina of Bangladesh, the new Prime Minister of Finland, Sanna Marin, and of course Angela Merkel of Germany, are all present-day examples of female heads of state with job approval ratings of at least 62%.
And contrary to sethnintendo's logic about women being dumber than men when it comes to matters of public policy, it may be worth noting that a recent study published by the Center for Economic Policy Research and the World Economic Forum has found that countries headed by women, in their words, have had "systematically and significantly better" public health responses to the covid-19 outbreak than countries headed by men, locking down earlier and losing only half as many people on average to the pandemic even after adjusting for differences in countries' various population sizes. I point this out to show, in yet another way, that electing women to public office is more than just a matter of preferred window dressing. Women tend to bring a different sort of mentality to public office that has real, demonstrable merit.
And yeah, I noticed that no scientists at all made the lists either of most admired women or men. I find that striking too for sure too.