The situation is unusual, where a somewhat lower HS GPA and a 4.0 college GPA in many advanced college courses (not just frosh-level ones) are presented. There have been reports of students with such a credentials being admitted to super-selective schools, but it is likely much less predictable whether any given super-selective school will consider the student an admissible applicant.
Probably the safest thing to do is find affordable safeties where the student is reasonably certain of admission with overall GPA (including the worse HS GPA as well as the better college GPA) to start off the list, but also consider highly selective schools as reach possibilities. However, the divorced parent situation complicates matters for the need-only schools that require both parents’ information.
Chicago might be worth a look from a financial standpoint (does not require non-custodial parent information for need-based aid, and also has a few merit scholarships), but no idea on whether it would consider the OP’s academic profile to be competitive.