Her name is Luna Lee, and she’s playing a traditional Korean stringed instrument called a gayageum. She has a whole YouTube channel devoted to her covers of classic rock songs, everything from Jimi Hendrix to Nirvana. I picked this one because 1) I love this song and 2) her solo pays a nice tribute to Billy Gibbons.
Just for comparison, here’s what a gayageum sounds like playing the music written for it. The most impressive part is their precise timing. I bet Billy Gibbons could teach them a thing or two.
https://www.youtube.com/watch?v=f8aIYc6NKv8