Claudia's Phone - some head cannon
I read the first book about a week ago and I was considering how Claudia had her own phone and private phone number.
It mentioned that Janine was always on her computer. In the 80's that would have been insanely expensive. I don't know if her school helped offset the cost, or if there was a grant, but getting a computer would have been a huge deal.
So my head cannon is that Claudia's parents got her a phone as a token to demonstrate that they were not showing favorites. Janine got a computer and Claudia got a phone.
She also got a lot more freedom than it seems like the other girls originally did, with the exception of the new girl Stacey. I think that again this was to balance out Janine going to college classes.
The Kishis were strict with studies but they always seemed to be trying so hard to not treat Claudia badly because she wasn't gifted in the same ways as Janine.