Because the phone in question used that Apple id precisely once, and is now configured with hers?
There's obviously some foreign key floating around keeping the association, even though it should not be there.
And that's ignoring the question of why and how, when syncing, backup, etc is turned off, my phone logs are even being sent to Apple at all, let alone leaked through to another phone? Same question with contacts - if I am not syncing or backing up, why does Apple grab my contacts?
> What else did you expect?
I expect, when logging in to a device with a given account, to only have access to things associated with that account.
I also expect, when configuring something to not share data, that it not share data.
Do you really have different expectations?