As others have said, it's just not customary to talk about the artists who wrote the song. In fact, I think in pop music..unless the artist says they wrote it, the assumption is they didn't.
The fact that she singles out Haley's song as one of her favorites/one that is special too her, is a good thing. IMO. Makes it more likely it is a single.
Haley is an incredible singer. Really incredible. I still say there just isn't a voice like hers, period. But I didn't realize that she was so talented at writing songs. And although Interscope didn't work out, Ole is working out quite well. And this only adds to Haley's credentials. For instance, if this song becomes a hit for Christina..that'll likely make Haley more appealing for her next label (and make the label feel she's worth investing in.)
I'm excited to see who else gets some of Haley's songs. I think it'll be fantastic one day to hear a Haley song on the radio, and then..perhaps..hear a song sung by Rihanna..written by Haley.