April 16th - Los Angeles. Next show after that is April 19th - Anaheim. This leaves two days open, which happen to be the first two days of Coachella.
Her promoter is AEG Live, for those who don't know they own Goldenvoice the producers of Coachella.
My two cents: if anything, she'll be a "surprise" late addition to the lineup, and if she plays anywhere but the Sahara there'll be hell to pay.