Prague, December 2019.

Patricia sings "Letzte Rose" from "Martha", by Friedrich von Flotow.

"Martha", a suspiciously aristocratic-looking milkmaid, is asked to sing a folk song to prove her humble status.

"The Last Rose of Summer" is a poem written by Thomas Moore, later set to a traditional Irish air, "The Groves of Blarney". Von Flotow kept the tune and translated the poem into German.

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Accompanied by the West Bohemian Symphony Orchestra
conducted by Mariánské Lázně.

I have extracted the video from Youtuber HarryE1969:
   • Patricia Janečková - "Letzte Rose"/Ma...  

and the audio from YouTuber Beautiful Music:
   • PATRICIA JANEČKOVÁ: Last Rose of Summ...  

Thanks to both for posting!