I translated some passages from interviews she gave to French press before and after she dropped UV:
At first, she was very happy with her work with Dan: "(...) Dan is stubborn, dominant, he likes when we first test his ideas. It was exactly what I wanted." (Libération Next)
"I had the whole album! I had twelve songs, I produced them all alone, but Dan opened my eyes. He told me that my songs sound too much like classic rock, too much in the style of the seventies. He took matters into his own hands." (Paris Match)
This one is weird, but maybe it's just me: "At first, my album and the Black Keys one was going to drop on the same day - May 1st. But after four weeks of recording mine, he was so involved that he was thinking it's his record." (Les Inrockuptibles)
But after the release and all the critics she received, she said for Grazia: "I was very happy about the release of Ultraviolence. But when I listen to my album, a few things that I felt when I wrote this songs tell me that I went too far. They have set me in situations I couldn't control, that I didn't want."
I have some more quotes from Grazia who really shows that she had a bad time with UV era: " At the very beginning, my feeling was really good, but later, when I was wondering how to finish this album, I became more introverted."
"[About being famous] I like to go out to dinner, but now it's impossible. Everyone has a phone, a camera... It's strange to say, but it's my everyday life: they take pictures of me even when I buy aspirin."
Also she opened a lot during 2014, we learned so much about her and her dark feelings.
Maybe I'm going too far, but I have a feeling that Dan changed her album a lot and now she regrets it because she don't feel the same anymore. It could also explain why she don't sing a lot of songs from UV during shows.