She came to speak at Parliament.  Theresa May didn’t even show up.

While I can’t find it yet as a video The Guardian posted her speech.

https://www.theguardian.com/environment/2019/apr/23/greta-thunberg-full-speech-to-mps-you-did-not-act-in-time?CMP=Share_iOSApp_Other

Climate change activist Greta Thunberg: ‘Listen to climate scientists’ https://www.bbc.co.uk/news/uk-48018034

Found it!