I'd prefer if she only sang songs that fit her 2015 voice.
She can still sing What's My Name, California King Bed, LTWYL Part II and Skin from Loud. Scrap Only Girl, S&M and Man Down (cries)
She can still sing most of Rated R, so I'd love to see her perform Wait Your Turn, Fire Bomb, G4L, Te Amo, RS101, ColdCaseLove and Russian Roulette.
From TTT, Where Have You Been, WFL. Please, please, please don't sing YDO ever again.
From UA, Phresh Out The Runway, Diamonds, Stay, What Now, Lov7 Song, No Love Allowed, Love Without Tragedy/Mother Mary.
From GGGB, Rehab, ballad version of Umbrella, acoustic Disturbia, Don't Stop The Music, Hate That I Love You.