It's partially how she stays so beautiful, but she still ages, just at a slower pace. But in this situation, she looks like she IS the girl. She's a face-stealer~
Lol sorry if it was hard to understand. She stole the face of the girl she had killed, you know, like the info on her page says she can manipulate the way she looks? Well, now she looks like the girl that Eric executed.
That's the point lol. She doesn't really think things through. It's basically, "I wan't you to do this, whether or not it's actually possible." Hey, I can't help it. She's needy :P But I'll add ONE sentence that might help