Just because she can't sing as well as other people doesn't mean she can't sing. Don't be one of those people who neglects her good performances. She wouldn't be in the music industry for THIS long if she didn't have a singing capability.
Selena can't sing lettuce be real, she's has no sense of pitch, zero support and a .2 vocal range, Katy's supported up to C#5 and doesn't start to strain badly until Eb5 which is mediocre but still vastly superior to Selena
But who cares I thought Selma was supposed to be an actor?(Even thought Miley's crushed her there too)