I doubt that will happen. I think people are just more excited for the return of Sherry more than anything else. Cause I do agree she looks a lot like Ashley all grown up, and people hated Ashley. It all just depends if she's useless and annoying. But based on what I've read about her in articles and what not, sounds like she will be a really good character.
I'm excited for her return, cause Resident Evil 2 has been my favorite Resident Evil for a long time.
The background version of her is not that clear but when I look at it I see the same character in adult form. Ashley had very distinct characteristics to her face that Sherry does share. Shape, eye color, ear size and hairstyle.