In Chicago I have Isabelle Adams who is her age! So there should definitely be something there! :D She could probably be Bells' Jessica Stanley line or something.
As for the boy.. hm. Christine has an older brother, who you played once in TAT, yeah? Laura also has an older brother, who I dubbed as Ryan but the name doesn't matter. As for a love interest? I have.. a lot who need them, so yes. Oh! He could be a cousin to Rosy? Or one to Holly?