She's trying desparately to distinguish herself from her sister. Stupid move really. She's only where she is cuz of her sister.
Also, it's no surprise that she was lip syncing. It's not any of those lame excuses her family comes up with. They're all lies. If you watched the MTV Music Awards, you saw her sing for real. Let's just say it wasn't pretty. When people say she's a no talent hack, they're not being mean and petty. It's actually the truth. She has no talent whatsoever. Her sister was bad on that show too, but it was technical singing. Jessica was just trying too hard basically. The basic voice was there, just controlled badly. Ashlee had nothing. No control and no actual voice.