She released her debut album last year, and she's been touring the UK to promote it. Unfortunately, she has yet to come to the US on tour, but if/when she does, I am willing to drive 6+ hours to see her. She's hilarious (https://twitter.com/katem3 - but remember, she's British, so don't be offended by her use of swears), and I bet she's really entertaining to see live.
Below is an official music video for a song off her first album (I believe she's currently working on her second) - called "Cursed." Listen, watch, and enjoy!
And here are some of her best covers (in my opinion):
Too Close by Alex Clare
The Only Exception by Paramore (collaboration)
Holocene by Bon Iver
Payphone by Maroon 5
I Can't Make You Love Me by Bon Iver/Bonnie Raitt