Great! I met her at ACT2018. I only discovered her blog after that. It's got the best introduction to the Yoneda Lemma - a [3-part series](https://www.math3ma.com/blog/the-yoneda-perspective) that starts with the important 'Yoneda philosophy' before getting into the mathematical details.

She also ran a Public Broadcasting Service show on YouTube called [Infinite Series](https://www.youtube.com/channel/UCs4aHmggTfFrpkPcWSaBN9g), which unfortunately did not go on forever.