Neither IE or Materials is at capacity. As stated above, your child should be able to transition to either major with a 2.0.
I also totally agree that Purdue does want their students to succeed. There is so much support- free help/tutoring, review sessions, practice exams, office hours etc…
The at capacity majors are BME, Aero, ME, and sometimes Chem E (it wasn’t last year but historically has been).