Sorry, but Rose's site says you can't modify her meshes. D:
9.Can I Modify/Clone You Mesh?
NO,most of the Mesh in my site are made by myself.
http://rosesims2.net/faq/faq.htmBut if it is for personal use in your game, then I don't know if it would be a problem.
I would be happy to do it for you in that case.
Let me contact Rose, and get back to you.