"So ... Yesterday, as some of u might know, I performed alongside @IggyAzalea at @SaturdayNightLive," she wrote in a handwritten letter that she took a picture of and tweeted
. "I was BEYOND excited (!!!) -- but unfortunately I had some technical issues which caused latency on my vocals, and as a result I got confused and my timing was off. It pains me and I'm SO sad today. But life goes on ..."